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];

  **  ** *    ** **    *    b[100];

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

int main() 
{ 
*** **** **  **   ****  *   *** a[100],b[100]; 
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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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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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**  **     **  ***   *     ** **      * ** **  %s",a,b);
**  ****  **      **  ** **   len = strlen(a);
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 *   *** *     **  * ** ****  *** 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()
{
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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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  * *** ****  * **  * ****** *  
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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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