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!
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#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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}
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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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***   *  **     * * *  ****   ****   *  * * 
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}

int main()
{
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**   ****   ***   
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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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** *****  *  **  ******  * ** ** ** ***     * * * * 
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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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