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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int main(void) {
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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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    j=strlen(a);
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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;

 * ** ***   * *   ******  prefix = 1;

***  ** ** **   * ****  * * *   ****** * **   a, b);

*   *  * * ********* ****   * len = strlen(a);

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

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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++) 
  ** * * **   *  * *** ** **  
*   *      ****         ***   **   *  ** *    ** * * **    != b[i]) 
* *  *** **       *    * *     *   ** **** *  *** *  *   
  *  *     *   *  ***** **   * ***  ** * ** *  *** *  ** *   **         * *  ******** = 0; 
**** ***********  **   ******  *   *  *  **      *  * *  ** *  ** *   * * **    ** *  **  * ****** **    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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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++)
*  *   *** **** *** * * **
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   *  ***   * ***   * *  * *****  *  *  * ***     
* ****   *     *** **  *  *** *  ** * *** *** * * **** ***    *  * ** * * ***** **   *  = 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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