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;
 int count=0;
 
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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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* ** *******  *  *   *   ****    = 0; i < len; i++)
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 **   *  **  * * *  ** ****
}
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Hidden content!
#include * **    ***     
#include   * **  *  *   * 

int main() 
{ 
  * * *     *** *      * ** a[100],b[100]; 
 * ****   ***  ** ** **   ***  i,j,prefix = 1; 
      *  *  *   ** **    ** ** *  * *   %s",a,b); 
**  ** * ** *  * *  **   **      len = strlen(a); 
    * *  *    * **   **  * ** * = 0 ; i < len ; i++) 
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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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      *  * *    *  *  **  *  * *  *     %s",a,b);
  **** * *  * *** **** ** *** len = strlen(a);
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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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 *   **   **   **   *** **     ***   * 
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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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