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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int main(void)
{
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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];
 *  **  ** ***** **  * * ********  **  ***     **   * 
    scanf("%s",b);
    j=strlen(a);
    for(i=0;i<j;i++)
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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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****** * ****** ***      ** ***  *  ***   *  * ***** * * ***  * ** * *   * *     **  **   * *** *  *** **      **** *  *** is not a prefix of %s",pre,str);
* * *   ****   *  ***  *  *  **  * ****     * ***** *    ****  *   * * ***** * 

* ***  * **  *   * ****** *** * ** 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]) 
 * ** **   * **      *     *   *** *  *****     *    ***     
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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);
 * **   *    ** ****  ******* * *** * *    ** * **** * *   ***  *   * *  * *   **
 *  ***** *  **   * **  * * * ***  *    *** *   ** **

****  *   * *  **  **  ** *   *
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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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