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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}
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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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 *      ****     ***** ** ***** *  * ****  **  **  *  ****  **  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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**   *   * * * **  * *  ** **    * 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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   * *     * * ** ***   * **  **  ** **       ****  * 
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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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