Final Exam 2 (20%)

Question

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

 

Answer 1

Hidden content!
     *  *****      * 
 ** *   ***** * *  * 

int main()
{
 * *** ***  char ***   **  
 *  *** *  **   int i,c=0;
 ****   * *  ** *    **  *   *  *** *******      *  * 
* ***        **  * * *** * * **   * **** *  **   
* *         * * **    ** ***  ** ***
   *  * **** {
** * **  ** *     * **  ** ** *   ****
  *    *  *     **    * *  *  * {
 ***   ** * *    *   *  ** *** ***      ** ** *  *  * *  *** 
*  *   * ******** ***** **  ** **    * * **  *  *  **  * **  * ** * {
* **                  *    **  *   * c=0;
**  *     *   *** *** *   ** ***  *  *      *    ** *   *   }
***   ***** *   **  * ** * * ** * * *   **    else *  ** * ** **      * ***  * 
*** *   *  ***  *    *   ***     * *   ** * *  * *      * * {
 ***  *   ** *   ***  * ***  ** * * * *** *  *****    ** ***** *  **  *       c++;
** ** * ** *** * *  * *** *  *   ** **    *  * **    *  * **  **  }
*     *** * *         * **  *  }
 * *   * ***  * *  
 * ****  **  *  if(c==0)
    *        ** ***    ** * * *   *** *   * * ** is not a prefix of    ** * *** *
 * *  *    **   else
**   ** **    ** ***    * *  *** ***     **   is a prefix of           
***   *   *  *  ** }
***  **        ** return 0;
}

Comments

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);
           ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

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

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Correct output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 2

Hidden content!
**** ** ***   *** ***     
*** **** *      **   
int main()
{
** * *      ** ap;
****          ** ** ** * *** *  * ******  *  *  || ap=a)
    **     ******* * *    *   * **  is a prefix of abcde\n");
    *** ****  *     
  ** **  **** 
*     *  * *   *  **** ***  ** **    * ** is not a prefix of abcde");
*   * **** ** **  *   **  *** *  **** * * ***    ****   *  **        *****   *  0;
* ** *** **********  *  **** ****       *  * * *     * ** *    **  * * *
  

Comments

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

---

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

---

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

---

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

---

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
            }
            ^

---

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
            }
            ^

---

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
            }
            ^

Answer 3

Hidden content!
* **    *  ** * *  ** *
** * *****   ** *  * **

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

int test(char p[],char s[],int pl, int sl)
{
*****  ******   ****    ***   * ***  i<pl; i++)
 * *  *  **    **********   *
**    * ** ** ** **    *  *  *       **  **      *  * **   (p[i]==s[i])
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*  *  **   ** * ** *  *  ** *****    * *  ***   * *   **    **** **  ***   * *   
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 * *  * *  *  *       *   *  **   ** **  **** ** * * *  ****  *  * **  ** * ***** * *   * **   ** ***  * *   1;
***  *  ** ***   * *    **  * ** **  ** *   *   *  * * *******     * ***   * * * ******
 **** **  * * **  *   *  ** *** ***** ** ****        *   * *
*    **    * **         ******  * ** ***  *  *   * * ** if(p[i]!=s[i])
*** ** **  **   *    **   * * * **** *****      **
* ** **** *  * **     **   **  **** **** ***  *  * *** *  * ***** ***  **  **  ** ** 0;
****  *  **   ***  *  * * *  * *** * ****  ** ** **   *  ** *
* * *  **** **   * *    *   *
}


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





}

Comments

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 4

Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
* ** *    ***   **     ***** a[99],b[99];
    int l,i;
*** *     **    *  *    * * **  *   ***
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   ***   ***   * * * *   **  **
** **    ****  **  *** **      *     ** **
    {
  ****  *** ***** * ** * **    ** **  *  * *  * * *     
    * ** *   *   *   * ***  **   **  *  ** ** * 
** *     *** * ** *   *  ** ***** *** * *****     *  * **  ****  **   * *   **  *      a prefix of %s",a,b);
 * *  *******   * *** * ****** *  ***  *  *     **   * **  ***    **  ***  ***
 *  * *  * ** ** * * * * *     ** * ***   *** **   *****
 ** *    ** *  ** *   * **     ***** ****  * *
* * **    *   ** *** **   **   **  *    **  *  ****** **  
****  * ********* *    *  * * * *  ** *      * **   **  ** *** ** *       *** *   ** ****   ****** **   not a prefix of %s",a,b);
**  ** *   * * * *   *       *  * ** ** *   * *  ***  *** *  ****    * * *    *** * * **
* *    *   * * ***   *   * * *  * *****  *****    
    }


}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 5

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;

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

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


****** *** ** **** ***  * **       * *
   ********  * ***    *
*  ** * **   ****   * * *   * *** ***  ****** * *** * ***** *       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;
}

Comments

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);
                    ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 6

Hidden content!
****    *  ** *  * * * 
* ** * *  *  * ** * *

int ***  
{
  ******  **   * ***  * * ****  ** * * *  no idea, I   * * even do it in the  *  * *  *** * *
* **   ** *** **   ** *** * 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 7

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);

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

}

Comments

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.

---

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__;
              ^~~~

---

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);
             ^

Answer 8

Hidden content!
    *  * * *** *   *
* ** *  *** * **  ***

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

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

  ** *    * **  ** 

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

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

}

Comments

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");
                                 ^

Answer 9

Hidden content!
  **    ** ** *  *   
    * *** * *** **   ***

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

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

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

****** * ** *****  *     ***    *  0;
}

Comments

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");
             ^

Answer 10

Hidden content!
***    *  *****   *****
 *   *    * *   *    *** * 
int main (){
char           
char **  * **
   *  ** *    * *  **    **  
   **   *   *** *  **   *   
    * * * ** *      * * * ** * ****
  * *  * **  ** * *** **  *
*  ***   ***** ***
**  *  **     * is a prefix of * *** *  ****** * *  **
}
else{
 * * **   * is not a prefix of %s **   *** * *  *** *
}
 **  * 0;
}

Comments

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);
         ^