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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}
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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)
{
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    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() 
{ 
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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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}

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(){
*  * ******    *  * ***  ** **** a[100],b[100];
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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);
* * ***** * **       ** * *  ****
**** *  **  *    *****    *    * ** 
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** ***  ** *   * **  ***     *  **** ***  
* * *  ** *** *  ***  ** *** **  *** * *  
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  ***      * ****  * ****     
**        * *    **    *** * **  **
   * *   *  ** ***  **   ** ** ***      *** *   * ****  **  ** * is not a prefix of %s",p,s);
*** * *  **   * * **** *** * 
   * ***    ****** ** *  *  ** 0;
}
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