1-11 Exercise 3: Prefix of a string

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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

 

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Hidden content!
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Hidden content!
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
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Hidden content!
#include <stdio.h>
#include <string.h>

int main()
{
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}
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Hidden content!
#include  * ***   * *  ***  
#include *  ***** **** *  *  

int main() 
{ 
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}
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:9:11: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     int n=strlen(a);
           ^~~~~~
prog.c:9:11: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:9:11: note: include '<string.h>' or provide a declaration of 'strlen'
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prog.c: In function 'main':
prog.c:8:5: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
     scanf("%s %s",a,b);
     ^~~~~
prog.c:8:5: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:8:5: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:15:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("%s is not a prefix of %s",a,b);
             ^~~~~~
prog.c:15:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:15:13: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c:21:9: warning: incompatible implicit declaration of built-in function 'printf'
         printf("%s is a prefix of %s",a,b);
         ^~~~~~
prog.c:21:9: note: include '<stdio.h>' or provide a declaration of 'printf'
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Hidden content!
#include <stdio.h>
#include      * *** *
#include * * *  *** * *  *

int main()
{
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 *    * *** ** ** ** * * ****** 0;
}
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Hidden content!
#include **   * **** 
#include   **  *    **    * *

int prefix(const char *pre, const char *str)
{

***   * ***   *      *  *** * ** ***** *   * ** * 
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}

int main()
{
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 **    ** *      *** *** *****
 **  ***   *  *** *   * *  *** *  *** ******  * * *   ** * *    is not a prefix of %s",pre,str);
 *** *  *  *  ******* ****  0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>

int perfix(char *a,char *b){
     *** *** ****    *** *  c;
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    }
}

int main(){
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   * **      **  *    * * **   **     * *  * * ****    * *  ** *   *  *   * is not a prefix of %s",a,b);
***  **   * ** ****  * **** * * 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>
int main()
{
* *  *********   *  *   *  ** * p[100],s[100],a[100]={};
* *  *  * ***       **   * * t;
*** *   ***    * **** ** *       ** 
     **    *   **   **   *   * *   *
 ********* *  *******  * ******* *  *    * ** %s",p,s);
*****     * ** *** *** ***** * 
   *      *   *  ******** *    *
*  * *** ** **********  *   **  * ******
*  *  *   *  ** ***  *  *   *** ** ***** ****** 
*** ** *  * * *  ** ** * ***  ***  
      *    * * **    ****   ***  *  * *** ******** ***   * is a prefix of %s",p,s);
 *   *  **    * ******* * *** 
  *** ****  ** * *  * * **  
******  **** *  *    *     ** * * *****  * **   **** ** **  *    is not a prefix of %s",p,s);
   *    ***** ** ** *** ** *    
***  *   * ** **** ***  *  ** * 0;
}
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