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

char prefix(char s1[], char s2[])
 {
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Hidden content!
#include   ** **   ***** **
#include * ** ** **  ****

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

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


}

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;
  ** * **  *  * *  *     *    ** ***** * * ******
** **  **  ** ** * *  **** * ** *  ** *  * ***    *    0;
*  ***   *    *     ****  *  *
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*    *    ** * **  ***  ******   **** * **  *   * **
  ****  * ***** ******  * **   ** *** *** ** *** *       *  ** 1;
    }
}

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