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

 

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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[]){
    ***** ** ** **** *  *  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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 * * *** **  *  ***** *   ***** = 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; 
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 * **** ****** * ** *** *  *  = 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);
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 ** *  ** *  *   *  * *  * ** 
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*** *      **   **     * **   *   **  *   *****   ***  *
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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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