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[])
 {
 int i;
 int length;
 int count=0;
 
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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()
{
*  ** ** **      *      **    ** * a[100];

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* *  ** ** ***** ** ** * *   ** *      **  ** ** * *       ***** **   is a prefix of %s", a, b);

 ** * *    *****  **  *  * 
}
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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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** **** ** ** * *  *** ***  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];
 *  **  ** *    **    * **    *  i,j,prefix = 1;
  **  *   *** ** * *  *    **  * ** ** * %s",a,b);
***       **** *  *  *   ** len = strlen(a);
* ** ******  *  *****  *  *  * *   = 0 ; i < len ; i++)
 * **   ****  *      *    *
 ***** ****  ***     * ** ****   * *  **** *  * ** *  *  *  != b[i])
***    ***** *    * **** *   **   **  ***  * * ***
 *   * *** *   * ***   **     *  * *  * *    ** * **    **  * *    **  ** * **  = 0;
**      ** * ****   ***** *  * ** * *  ** *   **  **  *** *  *** ** * ** *** ** * **   ***   **   is not a prefix of %s",a,b);
**   * * *** *** **  **     * *** * *   *** **     * ******    * *     ** *****    * *  * *  
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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;
 * *****  *  *  *  ** * **  **** **  **  *  ** *
   ** **   *   *  * *     *** ***  ** *   *** *   ** ****  *** 1;
  *** *   *  **  * *  ** * 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;
    * ** **   **   *** **** **
**  *** *   *  ***   *** *   
 ** **       *****        *   * ** ****     **  * * **** **          *** ****  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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