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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 **   * * ** * ***  *** **  *   * len = strlen(a);
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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()
{
**      *** * ** *** ** ****   * pre[100],str[100];
  * **** * **     *      *
  * ***   * *** ***  *   **       ** *   ***** * *  *
  *** *    *  * **   * ***   * *   ***    
   *  *    ***  * **  * **      *** *    * ***  ** *    * **   is a prefix of %s",pre,str);
* *  *  *  ******  *** * *** * 
 * *  **** ** *  ** **** * **  *******  ***  **   ***    ****   * 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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** *******  ** * *   *  *    ******   *  *    **  **  ***  * * * *  **    * *   **   * * *  *
* *  **  * **   * ** ***          * *****  *  * **   *** *  * *        * *** **  *** *** *** **    ***  0;
    * * **   *    * **  * *** *      *** *  *  **** * * 
 *  ******     * *  *  *  * ** **  **  **** * ****      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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