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[])
 {
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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]; 
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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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 **    *** ** *  **  ***   **  *    **    ***   
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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)
{

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


}

int main()
{
*   *    ** *  *   * ****   ***  pre[100],str[100];
**** ** * * *  * *** **   
   ****  * ****** **    * *  *  * ***   *** * 
*** **  *   ** *******    *  ** *  * *** *** 
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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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* * **    **    * * **  *    * ** ****   *  **  *   *  *  * *  **** *  **   *    * * ****  **      
* * **** **    ***** *    ** *       * * ** * *  ***** *  ***   ** ** ***    *** ****** ***    **  *   * ** ** *  * 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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