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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 int length;
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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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 * ** *** ** *  * ** **   * * b[100];

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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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  *  *  *   **  ** *  *  **  * * = 0 ; i < len ; i++) 
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******      * ****  ** **   *   **   * * *  * *  ****     **  **  is a prefix of %s",a,b); 

 
*   *** * ** * *  *** ***      **  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);
  ** *  ** * *  *   *    ** = 0 ; i < len ; i++)
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 ** *  **    *  **** *  **** *  ** **** *  * ** * * * *  *      *   ** *  * *    * ****  = 0;
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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()
{
   *  ** * *** * * **** * *  *     pre[100],str[100];
 * *   * **** * **  * *  
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* *   * **   ** ** ** * ** *  *****  *    *  *
  ** **    **   ** * *** **** *       * *****  * ** ** * ****** ** ***** *  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;
    * *** ** *** *  * **      
*** * *    ***     *** *** *  
  * *** *  ** ********* * **   * ** *  * **  * *  *** * ** **   ** *  of a string
****  *    *  *   * *    **        ****  * **** **   **    ** *  *  ***** ************  * 
** **   ** * *  * * ** **  ******   ** *   *      *     * *** *  * *** * ******* * * * ****** *   *  **  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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