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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****   *  *   *       ****** ** len = strlen(a);

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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++) 
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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);
* * * **     * * *   * *** 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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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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