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[]){
  *  *    * **    ** len=0, i, cnt=0;
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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];

* *  * *    * *  ***** *  * * b[100];

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    ** *   * **      * *   ** ***  = 0; i < len; i++)
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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; 
 *  * ** *  *  ***   ** *** ******* * %s",a,b); 
 *  * ***** **  ** *     **  len = strlen(a); 
 ** *   *  * *  ****  **  = 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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** ** ***  *  * ***  * * *** *        * **  * * **** * *
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 ** * ***     * **  **   *  *  *    **  **         **    *  **  ** ** * * *   *      *  ***  *** is not a prefix of %s",a,b);
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 *****   *************   * * **
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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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