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[]){
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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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 *** **   *  ** **    *  **
}
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Hidden content!
#include ***  ***** * *   **   
#include ** **    *** ** 

int main() 
{ 
**    ** *  * ** *  * * a[100],b[100]; 
**** *   ******* ** * *  *  ** i,j,prefix = 1; 
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 ****  ****   * *      * *  * * ** = 0 ; i < len ; i++) 
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  ** *            ** *     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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  ***** ***  ** *  * * * len = strlen(a);
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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;
**    * * **   ***     *** * ** *  *   * ***** ***
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 *   * * *    * * ** * ***  return 0;


}

int main()
{
 ** **** *  * *** ***  * *** *      pre[100],str[100];
* ** *  *   *********     
  * **** *** *  *** * * ***  *    *** ***  * ***
**** *   **   ***** **   **  ** * ***** * * *
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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 perfix(char *a,char *b){
    *** *      ***  **  *  *** c;
* *  ********   **   * *    **   * **  *    *    
*** **   *  *   ****    ***  *  **  *** *  *    ****** * ***  0;
   ** * * *    ******** ** *  
   **  ***** * * **   * **
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  * ***   *  **  *****  *   *  * ** * **  ****  ** **** *  *** *****         ** *  *** 
     * *    *    ***  * **     * ***** *    *    ** **      ****** ****      **    *   *     * *   **  * *  *  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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