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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 {
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Hidden content!
#include **** **  **
#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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**    *** *** *  *  *    **   *  0; 
}
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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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* * *  * *  ****  ** **  ***   *    *      *     ****  *   *    is a prefix of %s",a,b);


   ** *****   **   *   * *           0;
}
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Hidden content!
#include   * **** ** 
#include  *****    **

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

 ***   **    *** ***    ****  **  * *  ****   * *
 ** *      *  *      * **  *****   *  ** *  **  0;
** *** *        *    ** * *  * ** *   *     *  ****
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* *   *   ****** *  ***   * return 0;


}

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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   ** * **  ****  **   * *****     *  * **  *   *  *
* ***  * * *  ****   *    *      ** * **  *  ** *** **** ****      1;
    }
}

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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