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[]){
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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);

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