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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int main(void)
{
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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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}

int main(void) {
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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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    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++)
* **** ***********    **  *
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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++) 
* ********   *  ** ** ****   
  ** *  ***  * ******  * * **   *** ***     *      *   *  ** != 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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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;
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  *   ** *   *    *  **  ** ***  **** *  **  *   *  * ** * *   *  * *   ***   **
 *   *  *   * ******   * *** *  * ******* ** *  **

 *  ***    ** ** *  ****
*   * * * **** * ** * **       *  * == 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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