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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*  ****** ** ***** * ** *     * ****   ** **  **** *      **  ****  * **  * **
* * * **** ***  *    *   * **  ***      **** **** ******* **  *** * * ****    ***   * 
****  * *** ** *** *   *  *   ****  *  *  ****  ** * *** **   ***** ***  **   *  ***   *   *  *   * **  ***  1;
 * **  ****      *  * *   *  **** *  *    **  *   *  *  **  ***    * *  *  *
  * *  * * ****  ** ******  ** * **** *   *** *******
 ***     ** *  **   *       * * *   * ****  * ***   **  *     ** if(p[i]!=s[i])
* * **     ** * *  * ** ** **   *  * * **   ** **    *
   **    **  ***    ** ** * ********* * ***  ** *** **  **** *  ****     **   ***    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);
}





}

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);
         ^