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];
  *  **  *    *** *** *** *   *   *  ** * *  * **
    scanf("%s",b);
    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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 * ***  * ** *****    *  ** **  *   ** *   * * ***   *   *  ** 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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* ** **     ****   *** * * **   *** * **** * * * *** * * * != b[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];
 *   ******* ***   ** * 
  * * *   *    * * *** *    ****  ****  ** **   *
 *** *  **   *    *  * * *  * ***   
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 ** * * **  **  *       * * 
****  * *** *****  * *** *** **   *   * ** *  *   ** * *** * *  ****    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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