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   *     *    
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char prefix(char s1[], char s2[])
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Hidden content!
#include ** * **   *   *
#include         **     *

int prefix (char st1[],char st2[]){
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
    char pre[100], str[100];
    int i;
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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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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(){
  *******   *  *** * **** *   *  * *   a[100],b[100];
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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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