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

   *** * * ** ** * ***  b[100];

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

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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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 *   *** *     ***** ** ***   * **  *  *** *    * * *** ** ****  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);
 * **  **   *** **          **** * ****  * * * **  ******  **  **** * ******   ** * *** **
   *   *  * * *       ***  ***  * *  * ***  * * * 

 ** ****** ** * *   *** ***
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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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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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