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!
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#include        ******* 

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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)
{
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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()
{
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      **** **   * ***   *       0;
}
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Hidden content!
#include  * *** **   *  **
#include *  ***  * *

int prefix(const char *pre, const char *str)
{

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