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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*** *  *   **   *** ** *  ** 0;
}
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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];

* *  ***   *    ***  *  * ** i = 0;

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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; 
}
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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];
**  ***  *******  *     *   i,j,prefix = 1;
 *** ***** * *  ***** *  *  **    ** %s",a,b);
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 *** *** *       * ** * *  *** **  **** *  *   * ***  ***  * ** **** ** *** **  *** * *
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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()
{
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* *  *****   *** ****
 **  *  ***   **       **    * *****  **   *
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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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