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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Hidden content!
#include * *** ** * *
#include   *     * *****

int prefix (char st1[],char st2[]){
    *  * **** *  *   *   * * **   len=0, i, cnt=0;
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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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}
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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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***** *  ** ***** * ***  ***   ****  **** *   * *   a, b);

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

  * *  *** ***   ****  ***  = 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); 
*******  *   ** **  *    *  len = strlen(a); 
 **** * * **    *  **** ** = 0 ; i < len ; 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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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);
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  **  * ***   *** *  * * * ****** *** ** ** ****    * *** 
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**  * ****     ** *    **  *****  **   **  *    *   **** * *       ** ** *  
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 **  *   ** ** ** * ****  *** * *   == 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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