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

 

[Exercise] Coding (C) - asked in Chapter 13: Strings by (12.1k points)
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Hidden content!
#include       * *    *
#include  **      *  *  *  

char prefix(char s1[], char s2[])
 {
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Hidden content!
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
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}
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Hidden content!
#include<stdio.h>
#include<string.h>

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

int main()
{
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}
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#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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#include <stdio.h>
#include <string.h>

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

int main(){
* * * * **     *    ** *  *  a[100],b[100];
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**   **  *  *  *              ** *     ** *
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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;
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  ** * *   ** * *   *    *** * ***      
   **    * *      ** *  * *   *  ***  %s",p,s);
* **    *** ******* *   ***  * *
 *** *    ** * * ****** ***  *** ******
 *   ** * * * ** ** **    **    *  
 *    ***** *****    * *  *** * * *** ***** **    
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   ***  *** * **  ** * *     * * ***      **** *  ***  * ** *  ***  ***  is not a prefix of %s",p,s);
  * * *     ***** **   *    *
**** *** ** **   * ** *  *** ** * 0;
}
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