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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*****   * *   * *   *  * **
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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];

** *** * ***  * *   * ***    ** i = 0;

**   *  ***     *  ** **  *    prefix = 1;

*   * ** * **   ** * ***   **    **** * * **   * * a, b);

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

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