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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   *     * *  *  **** *   * *  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()
{
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  *** *    ***** * *  ***  b[100];

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

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 ***  *  *  *** * *    **  **** * **   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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#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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