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[]){
 ****** *  * *** * ** ** ***   * len=0, i, cnt=0;
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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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    j=strlen(a);
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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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 *      ** * *  *  *   **    *** ********* **   * **** ** *   ** is a prefix of %s",a,b); 

 
   *  * *   ****** * *****   *     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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***** ** *   *   * *     * 
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**** *    *  ** **     * * **  **  *      **  * **  * **
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** *  * *****   *    *****   *  **  ****     * **  ** **** * **  ** *** * *  **      is not a prefix of %s",a,b);
*  *   * ***   **    *   *    ** * *      ****    ***  * * *  *  *******  ** *   * * 
 ****    **     * * *****  ***  *  **   *  * ** * ** * 

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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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