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[]){
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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);
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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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* **    *  *******  *****  len = strlen(a);

 **** ****** * * *** *  *   *  = 0; i < len; i++)
    **  *     *       * ***
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     **  ** ***** *  *    *      * *  ***      
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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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 * * **  ** ****  * **   ** *  *   ** *  *  *** * ** ***** ***  **   * ****  * ****  ** 
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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);
*  **********   ** *  **  ** *     **   *****  * ***** ** ** ***** ** * *** *  **
**   **   ***  **  **     ** *  **** *  *  **   ** 

* * * *** * **** ** *  * * *
 *   *  * **   *  **   *  ** * ** *  == 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;
 * ** *      *     * *** *  * **    **** ** *   ** 
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     **  *      * * * ** *  * 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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