Final Exam 2 (20%)

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A string p is a prefix of a string s if the leading characters of s are identical to p. For example, "abc" is a prefix of "abcde". Develop a function prefix that checks if a C string p is a prefix of another C string s.

p是s的前綴若s開頭的一段字串等於p。例如，"abc"是"abcde"的前綴。寫一個程式 判斷字串p是否字串s的前綴。

Example input 1:

abc
abcde

Example output 1:

abc is a prefix of abcde

 

Example input 2:

bc
abcde

Example output 2:

bc is not a prefix of abcde

 

[Exam] đã hỏi trong Final Exam
ID: 42299 - Xem được từ: 2018-01-17 14:00 - Hiệu lực đến: Không giới hạn
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Hidden content!
****  *      *  * 
 * ** * * **   * * *

int main()
{
* * * * **  ** char   *   * *  
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** *                  ** ***  * * *  c=0;
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**  **          ** * * ** *     * * ****  ****  ** else     *    *  *     ***** * **  *
*    *          *   * ****    ** **   *  *  ** *   ** ** {
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**  * ***** *  else
*  **     *  ** *  *   *   * *  ** **   **   is a prefix of *** ***** * 
 * * ** *  ***  }
* * * **  * ** return 0;
}
trả lời bởi (-258 điểm)
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prog.c: In function 'main':
prog.c:8:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&a);
           ^
prog.c:9:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&b);
           ^
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0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
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0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
đã bình luận bởi (4.3k điểm)
0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
đã bình luận bởi (4.3k điểm)
0 0
prog.c: In function 'main':
prog.c:10:6: warning: implicit declaration of function 'stlen' [-Wimplicit-function-declaration]
   if(stlen(b)>strlen(a))
      ^~~~~
/tmp/ccnE3ufV.o: In function `main':
prog.c:(.text+0x5b): undefined reference to `stlen'
collect2: error: ld returned 1 exit status
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0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
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0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
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0 0
Case 0: Wrong output
Case 1: Correct output
Case 2: Wrong output
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0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
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0 0
Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output
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0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
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0 0
Case 0: Correct output
Case 1: Correct output
Case 2: Correct output
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Hidden content!
 * *  ****   * ***  
*    ** ** **    *** *
int main()
{
* ****  * ** *  *  ap;
 **  *** *** *** * *  * *  *** **** ***   *   ** || ap=a)
   *   ** * * *** **       *    *   is a prefix of abcde\n");
 *  **    ***  * 
*****  ***  **  
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    *    **    ** * **  ***  *  **  **  ***  ** ** ***********  ***  *** **  * *** * 0;
* **   **** ****** * * ** *  ****  ** *   * * **  ** * *   ***   ** *** * * *  
  
trả lời bởi (-167 điểm)
0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input
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0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input
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0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input
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0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input
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0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^
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0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^
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0 0
prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^
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Hidden content!
**  * ********  **
* ** * ***  * **  ****

char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
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*   **    ****     **  ***     * *   * *   * **     *** * *
** **** * ****  *  **  ***  ******     **  *     *** *  * ******** * **  *   **     0;
  **** **    * *  **    *****  **  *** **** ***   ***
* *  *** **  ***  **  ** *  
}


int main()
{
* *   ***   
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******  *  * ",p);
* **          **    *  *  *
*   **    **    **  * 

sl=strlen(s);
pl=strlen(p);


 ** *  **  **** && pl<sl)
{

  *******  *   **  **  *  *  **   * *** *** *** is a prefix of %s",p,s);
}else
{
printf("%s is not a prefix of %s",p,s);
}





}
trả lời bởi (-336 điểm)
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Case 0: Correct output
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Case 2: Correct output
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
*    ** ***** * ** *  ** ***     * a[99],b[99];
    int l,i;
  * * *** * ***  * * * * *   **  *   *
*** ** ***  **    *  ********** * **  *  *  
*  ** *****  *    **    *   ****  
 **  * *   * **   ********   ** *  * ******
    {
 ********  *  *  * ***** * * *  *****  ****  *** *     * ****  
 *  * * *  *  *   *** *** *     *  ** *  * *  
*  *** ** ** * ** *    *****   *    *****    ***** **** **  *  ** ***  ** **  ** *     *  * **** **    a prefix of %s",a,b);
 ** * *  * * *   *****  **    *  ** * ***  *       ***  ***** ** *    * * * *** *
* ** * *  *** ****** * ** *  ** ****  *  * *  **  * * 
     **     *   *  *** * *    ** ****   ***  *   *  * **** **  * 
 * *** ** * **   *    *  * ** ***** * **   * **   ***
  *   *  **     * ****     **  * *  ** * *   *   *  **   **    * *****  *      * ***   * ** * * * not a prefix of %s",a,b);
 *   * **  *  * ** *  **   ***  *****   *     * * * ****  *   *** ****  ** ** *** *
  *  *  ***** * *    * *** *    ******** **  * *     **
    }


}
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Hidden content!
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int prefix(char a[100],char b[100]);


int prefix(char a[100],char b[100])
{
** *  ** *   * ****** ** **** i;
 ** **** * * *  * ** *     count=0;
* **** ** *  *  *****   *  len;

 *** *  **   * *   **  * *   * **  * 

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***    ** ***  * *** **   * ** *
 *  *     *  ***  * *****      **   **   **** ** ****    *   *
     *   *  ****  **      ** *  **   * **  *   ** * ** 
** * **   *** *  ****      *  *    *   *  **    *       *    **    * * *  *** * *       
** *   *   **    **   *    *** **  *  *    **   *
 *       *  *** *    ***


 *  **  * * **  **   * ***** **
  *  * ***  ** * ***   *  *
* *******  **  * *** *   *   ** **   **  ******  *      *    1;
   *** * *     * ***      
*     ** * * * * *    *   * * 

   return 0;
}


int main()
{
 * **   *  * * ** * *** **** a[100];
* ** * *     *  ** * * ****  *   * b[100];


* **  * * *  *  * * **  * * *** ***** *****  * *  *  
*   *** ** *** *  ** ** *      **  ** **  *********   *   *   

  * ***  ****  * *  * **** *  *  
*  **   * * *   *   **** ** *    ** ****

 ** **************** * ** * *  ****

 {
   **  * ******** **    ***   **  *  * ** **** **  *  * * is a prefix of %s",a,b);
   * *** ****  **** ** *  * **  ***
******       *** * * *  **** * *
  ** **  *   * *****  ***  *
  ******  ***    ***   ****        * *** *** ******* ** ** *** ***   **    is not a prefix of %s",a,b);
   *  ***  ******  ** * * 


*  ** * *  ** * ** ****  *     0;
}
trả lời bởi (-193 điểm)
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prog.c: In function 'main':
prog.c:45:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&a);
               ^
prog.c:45:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&a);
                    ^
prog.c:46:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&b);
               ^
prog.c:46:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&b);
                    ^
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0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
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0 0
Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output
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Hidden content!
** ***  ** * ***  **
  *****       * ***  *

int * **
{
 ** *   * *    *      *    ***    ***   *  **  no idea, I      even do it in the   * * *  * * **
*  * *******  *   *    * *     0;
}
trả lời bởi (-168 điểm)
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Hidden content!
#include  *         * ** *
#include    ******     
#include ***  **   **** ***

int pref(char[],char[]);

int main(){

* *  * *       *******  * *   *  p[10],s[10];
******* ** *  *     *     * num;

 **  *      ***  *  *   ** ** *  
** **  *** * **   ***  **  
**  *** ***  ***  ** *  **   ** * **** * ****       ** 
**       *   *   ** ******  *     ***   *  ** * ***  **

* **  *** ** *     ** *    = pref(p,s);

 ***  * ** ** *** *** *** ****** * * *  
***** * ** * * ****   *    *  **   **  * ******   ***  ***   * *** * ** is a prefix of %s",p,s);
* * **   **    * * ***       * * *
*    * ** * **  *  *       ** **  **  **   **     * *** *****   *  * **  is not a prefix of %s",p,s);


 return 0;
}

int pref(char p[30],char s[30]){
* ***  **  ***   *    ** *    i;

*****  **         ***  *  ***  * ** * **  ***
* *  *  *** * ** **    ** **     *     ****  **  *    *     * *   *****  ** * **   **  *   * *** ** ***** **
*** *   * * ***** * *   **    * *   ** *   **   ****     *    * *** * **  ** *    * ** *   **** * *  **   is a prefix of %s",p,s);
  **** *** *******  *  **   ** **      * ** * * *   ***   
 * ***   * ** *** ** *  *  * *** * ** *   *    ** * *    ** **** **  *** **  * **   ** *   * *** *   is not a prefix of %s",p,s);

*  *        *  ** * **** * ** **

}
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prog.c: In function 'main':
prog.c:12:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:13:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/cc0tBG5r.o: In function `main':
prog.c:(.text+0x1f): warning: the `gets' function is dangerous and should not be used.
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prog.c: In function 'main':
prog.c:10:13: error: stray '#' in program
     int num;#include <stdio.h>
             ^
prog.c:10:14: error: 'include' undeclared (first use in this function)
     int num;#include <stdio.h>
              ^~~~~~~
prog.c:10:14: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:23: error: 'stdio' undeclared (first use in this function)
     int num;#include <stdio.h>
                       ^~~~~
prog.c:14:1: error: expected expression before 'int'
 int pref(char[],char[]);
 ^~~
prog.c: In function 'main':
prog.c:23:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:24:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^
prog.c: In function 'main':
prog.c:51:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:52:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
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prog.c: In function 'main':
prog.c:14:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:15:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^
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Hidden content!
* ** ** * ** **  ** 
**    *  * * ** * * *

int main()
{
  *  *** length1, *    *  c;
   * *** a[100];
  *     *   b[100];
 * **   ** ** d[100];

    ** ** * * * ***    ***  **** *****
 *  *** * ** * **    *    ****

***  **** ** *    **

 *****  *   * ** * *  *

  *  **  * **  *  *
* * **   
  * *   **  ** **** ** * is a prefix of  *****   
 * *** * 
***  *  *** *** **
*****  
 *  *** *  **  *****     is not a prefix of   *  ***   
   **  * **

}
trả lời bởi (-66 điểm)
0 0
prog.c: In function 'main':
prog.c:11:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&a);
          ^
prog.c:12:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&b);
          ^
prog.c:24:11: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
           ^
prog.c:24:33: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
                                 ^
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Hidden content!
     *** * ** *  ** 
*  * *** * *  *  ** **  

int main()
{
  **  **  ***     * * *** ** * * str;
*  * **  *****    **** **  * * i, p, s;

*   *  *  *** ** ***    * *****  *** * *** ** * &p, &s);

 * ** **  *      *  *   ***   * *   (i<=0; &p; i++);
  **** *      ***      ***  * 
**   * * ** **   ***   **********  *  ******   &p);
* * ***  ***   ***   ***           *** ****** ** ** 
 * ***       ******   * **  
     * **  **  **** ** 

 **  * *******   * *  *   0;
}
trả lời bởi (-233 điểm)
0 0
prog.c: In function 'main':
prog.c:12:7: error: expected '(' before '{' token
     if{}
       ^
prog.c:13:12: warning: too many arguments for format [-Wformat-extra-args]
     printf("abc", &p);
            ^~~~~
prog.c:14:13: warning: format '%d' expects a matching 'int *' argument [-Wformat=]
     scanf("%d");
             ^
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Hidden content!
**   * ****  **** ** * **
 * **       * * * * * * * 
int main (){
char ***   *  ***
char    * * 
* **  ***   * **         **  
 *     ** **  *  ****    ** ***    *  *
** ** * **     ***  ***  *  
     *** * **   ** ** ***  ** *  
*    *   *  * *  *
 *     **  ** is a prefix of * *  * ***    *     * * 
}
else{
**  **  ***  is not a prefix of %s **  * *    **  
}
  * ** 0;
}
trả lời bởi (16 điểm)
0 0
prog.c: In function 'main':
prog.c:7:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string1);
         ^
prog.c:9:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string2);
         ^
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