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[]){
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}
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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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    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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 * ***  ******   *   *** ** *   = 0; i < len; i++)
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  **   *** *   **  *  *****
}
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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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 *   *  *  *  * *   *    **   *   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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 *** ****    *   **  * *   *  * *  * **** *     **     *
*** * **  ** * *  **   * ********* ***  * * ***  **           *   **      * *  *  = 0;
***  ** *** *    *   ****** *  *** *       ** ** *****  *  *  ** **** ** *** *  **  *** *   **  *   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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