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

 * **     **** ** ***** ******* = 0; i < len; i++)
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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); 
***  ***  * * **     * = 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);
**  ** * * * *****  ** * ****** len = strlen(a);
***   **** *** ** *  ****** * * * **** = 0 ; i < len ; i++)
 ***** *** * * * * * **** 
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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)
{

 *  *   ** ******* *  ** ********   *      **  * 
  * *  *  *    ** ***  *** ***    *   *   ** *** ** * 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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