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

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