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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    ** **** ***** * ***  ** * *   *   **  ***** ** * * **** * **** * 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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 ***    *   *  *  ****   *  *    **    **    **** *** * * 
 * *     **  * ** ***** ** ***  ** **   **    * **  * ***** **    *   **    *   = 0;
 **  **** **  ** ** *  * ***  **   **    **   ***   **     *********  **   *  * ** ***  ***  *     is not a prefix of %s",a,b);
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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;
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**      *  ***  **  *** ***** 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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