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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}
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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); 
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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];
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   * ** * * *** *   *** *****  ** **  * *    %s",a,b);
 *  *  ****  *  * ** *  **  ***  len = strlen(a);
* *  * *  *       *   *   *  ** * = 0 ; i < len ; i++)
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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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