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    *   ** *  

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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<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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  **   * ***  *  *** * ** *  ** 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;
 *   * *   *    *  *******   ** *   ****   ** 
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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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