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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int main(void)
{
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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];

 ** *  *  *  ***   **  *  ** i = 0;

   * *** * *  *    *  *   prefix = 1;

   * ** * ** ***  **  *  *   *    * *** ***   ***  a, b);

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