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

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*   *  *   ****   *  * *  ** **  = 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++) 
 *  **           *   *** 
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   *      ** **  * * ** ** ***      ***  *  ***** 
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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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***     ** * *  * * **  * * * *** ** **** *  * 
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 * * * *   *  *   *   * *  * *  *** *    *  *  *  **  *  * ** *    ***    **   * ** *  is not a prefix of %s",a,b);
**   **  * * ***  ** **   ** *      *  ******  * **  *  *   **        **    ***  * *    
*  * * * * *** *  *      * *** *  ****   ** *  * * *

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