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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*  ***  ** **   **  **** ***  * **** 0;
}
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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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****  * ** ****** **  *******  *  ** * ** * *  ***** * ***** *** ** * ** **  *      **  **  ** *  *     *  * is a prefix of %s",pre,str);
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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++)
   ***  *  *    *  *   ***     ***
**** * ** *  *  ***      ***  ***  *    ****  ** *  **** *   * *   != b[i])
*  * ****    **  ** **    * ** ** ** * ***** *    *
 *** ** *** *  *** * * ***** * *  * * *   ** ** *   ** *  ** * ***  *   *** *  **** = 0;

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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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  * *     * *****  * **** ** * ******* * **  **    **   *   *  ***     * * ** ** ****   = 0; 
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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++)
     **   ****  *   * *** 
 *  *** **   *  ** ***  *   ** ********  * ******  *  *   ***  != b[i])
 *    * ****** ** *  **  ***   * *** *  ******   ** * * **** 
 * *  ** *** * **  **   ** * *     **** **   *   *** * *  *****   *    ** * *     = 0;
    ***** ***  *** * ****      * *    *     ***  *   * *     ** *    *  * * **  **** 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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