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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}
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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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 ****       ***** * ** * **** **** 0;
}
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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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0 0
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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***  **** ***** *  * *** *** **  ****
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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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