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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char prefix(char s1[], char s2[])
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Hidden content!
#include *** ** *  * **
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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)
{
    char pre[100], str[100];
    int i;
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}
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Hidden content!
#include <stdio.h>
#include <string.h>

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{
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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);
*  *  ** *********  **  * ****
 * ****   **         ***   ** **
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 * ***   * *  * ** * *   * 
   *** *   **** ** *  **  *  0;
}
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