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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** * **** *  *  * * ** * *       0;
}
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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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  **     *  *****   *******  **   **    * *** **  *  a, b);

*   * **  *        **** *** ****   len = strlen(a);

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 **  *   * **** *  * *   *  * ***** *  ** **  ** *** *       *   **   is a prefix of %s", a, b);

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

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