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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}
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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]; 
****  *  **  **   *  *  i,j,prefix = 1; 
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**    *  *   * *   * * *   
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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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*****  *    ** * ** **    ***  * len = strlen(a);
 ***** * ** ***   **  * **  * * ** = 0 ; i < len ; i++)
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  **** **        *  *  ***    * ***     *** *****  ** 
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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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*   ***  **  * *   ****     *  *  ** * *   *** *   ** *  ****
*   *    * *  *  **** * * * **  ** **** * *  ****  ** *  *   * 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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