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

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