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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Hidden content!
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Hidden content!
#include<stdio.h>
#include<string.h>

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{
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Hidden content!
#include<stdio.h>
#include<string.h>

int main(void)
{
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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;
 ** ** * *   ***   * * **  * ** *  ****   ***
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 ** * *     *   **** * * ** *** ***** **  *  %s",p,s);
 ** *   *  *****  **** **** ***** *  ** * 
 *  *  ****    * * ****    **  *******
  * *  ***  **   * * * * * *  *       ***
  ***   * ** *****  ** * *   *     *** *  *    *
 *  * * *  * *  *** ** **   **** ***  **
 * *   ** *    ** * * **   * * *  ****** ***  ***  *  **** **  * is a prefix of %s",p,s);
    *** ***** ****** ********    
 *    * **   *   ***   *** * * **
       ***** **    ** * ** *** * *  * * * ***  *           *  **   *  *  *   *  is not a prefix of %s",p,s);
*   ** * **  * *****  *   ** 
 **        * ** *********** * 0;
}
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