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!
#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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****      *******    * ***     0;
}
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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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0 0
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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 ****** * * ** *   * *** * * *   *   *    ****   ***  ** *
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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);
* * **  * * *  *  *   *    *  * 
   * *     *  *** **** ****  * * *   
 * ** ** *  * ****  *  ***  *******   * 
 *   ** * * **  *** *    **** ** ** *  ** * * *  
**   * *    ****     ****     ** * *   ****
 ****          ***   *   **      *    ** **  *  ***  *   ** *   is a prefix of %s",p,s);
 * * *  *  * * *  *****  ***
      ** **  *   ** * **    *  ** ** 
 ** *   * *   *   ***  ********   * *  * **     *  * * ***** ** * is not a prefix of %s",p,s);
*****    ****** ***  * ***
*  *  ***  **   * ****   *    *** 0;
}
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