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

int main(void) {
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   ****    ** *    *  * ***      st2[256];
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*****    * *  ***** * ***** 
*    * *  *****  * * * * *      * * ****** *********  * *   *****   is not a prefix of %s", st1, st2);

**   ** ** *  * ** *  **** ***** ** 0;
}
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i,j;
    char a[100], b[100];
 *  ***** ** *******  ** ** *   *  *  *    * *   *    * 
    scanf("%s",b);
    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])
*  * ** **  ** ******** **  **  *   * * * ** ** ** * * **   
    *  *  **** ** *   ***   *  *  ****  *** *  **** *** * ***** *    *   *  **     * = 0;

    *** *   ***  *** **** * *** ** * ** ****   *       *    *** **  ** *** *     * ***    * ** * ** is not a prefix of %s", a, b);

*** *  *****  * ** ***      ** **  ** **    **** *****  ** ***** ** ***   *  * * **    *     
 *   *  ******  **  *****   *  ** *   * ***  *  * *** ** *  * *
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*   *   **   ***  **** *     == 1)
** *  *       ** *  *     *
***** *****  **          **** ******    **    **  *    ****  *  *      * 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; 
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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++)
  *******   * *** ** **** ***
 *** **  *  * * ** **    * ********   *  ****** *     ** != b[i])
** **   *    * ****   * * *** ****  *  *********   ** 
** ** ** * *** * **  * *  * *  *   *  * **      *   * * *  ******* *  ** *   * *  * = 0;
    * **  **   *   * * **  ** **  *  **   * * **  * *  * *** * * *   ** * **  * * **     *  * is not a prefix of %s",a,b);
         * **    *** ****   ** **  **  ***  * ***   **** * * * * * *    *  *     *  *
 **  ****  *  *   **  ** ** *** *   *   *    ** * *** ******** 

*        *     * *   **
**  *  *********   ** *  ** *  *  == 1)
**  * ***  **    *    **  ***  **   * *    * *  ** **   ** * * * 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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