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

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