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!
#include   **  ** *   ****
#include  ** **********  **

int prefix (char st1[],char st2[]){
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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>

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)
{

***  *** *** **  ** **    **    ***  * *  ** ***
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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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*   *****  * * *   ***   * *****
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    }
}

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