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];
***  ***        *      *  ***  ***  *         *** * 
    scanf("%s",b);
    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];

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