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!
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#include    *        **  * 

char prefix(char s1[], char s2[])
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Hidden content!
#include *   ***  *    ** 
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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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}
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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() 
{ 
   ***  * * * *  **   *    a[100],b[100]; 
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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()
{
****  ** ********  *** **   *  a[100],b[100];
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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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*****        ***  ***  **   ***  
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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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 **  ** **  ***  **   * * ***  * * 
   *  *****         * *       * ** **
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    **  *       ***** *  *** *  * **  * *   *   ** ***  *  **   is a prefix of %s",p,s);
 *  *****   *** *  ****  *** * 
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 **  *** * * * ** ** * ****  *    *    ** **** * * **** * *  * * *   is not a prefix of %s",p,s);
 *      *  *   **** * ***** * *
*** ***  * **  ** **  *  **** *** 0;
}
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