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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  * *   ** * **    **  **    *  *   * ****    ** *   ******* *    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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0 0
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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 ** **  **** *       * *   *  * **** * ******   ***      * * != b[i])
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 ** * ** *  ** * **  *  ** *   **  ******* *    ***** ****    * ** *  * *  **** * * **** is not a prefix of %s",a,b);
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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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