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;
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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()
{
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* *** *  *** *    * * ******  b[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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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);
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 * * * ****  *  *   ***  = 0 ; i < len ; i++)
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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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