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