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;
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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];

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  * *  ** ** **  ****   **   ***
}
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Hidden content!
#include * * **     **** 
#include   *** * ** *   *   

int main() 
{ 
    ** **   ** **    * *   a[100],b[100]; 
****   *  **            ** i,j,prefix = 1; 
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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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0 0
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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 * *  ** *  *  ****  ******  * **  *  **  ** ******   **   ** **  **   *** **       *
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*  * ** * *        ** *  * *  *   ** 0;
}
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Hidden content!
#include  ** * * ***** * 
#include  *** **   * **  *

int prefix(const char *pre, const char *str)
{

   **   ******** **  * ** ** * *  *** *    *** ***
*   *  *  *    ***   **  *     *   ******      * **  * *** 0;
****  ***    *  ** ** ** ***** ***  *    **   ****   *
 ****     *    **   **** *    * ** **** **  ** ****  *  * * 1;
 * *   *** *    *   * *  * ****   return 0;


}

int main()
{
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*     *  *   *  * **  
*   **  ******* ** * ** * ***       *     *  * * *** *  
      ** * * ****     * *  *   **   
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********    *****   *    ** * * 
  *  *** **    * ***  ** **  *** *  * ** ****   * *** **  * **  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;
 **     * ****  ***   ** **** *       ** *******
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  *  ***** ****  ****  * * 
****** **  *  *****   *
 *    *  * *   * ****  *  * ** **  **** ****** **  *  * *    *  * ** * ****** * ***  * of a string
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 * *   ****  **   ** *   *** ***  **   *  ***     **  * * * *  **  ** * ** * ** **       * ***** **** *** *** *   ****    * 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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