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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  **   *** *  **   *   **   **    ** ** 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; 
    * * *  * ***** *    *   *** ** * * * ** %s",a,b); 
  *** ***    *** **** ** **   ** len = strlen(a); 
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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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*** *** * * **  *  * **  **     * *  * *  ****    *****   *  ***** * **** **  ****** *   *  *  *  is not a prefix of %s",a,b);
 ***  *  *  * *   ***  * * *** ***  **** * ** *    * ** **  ** ** *** **** *** **  
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 ***  * ****** *  *  * ** ** *
 * *  * ******   * * **  * **  **    == 1)
** **  *   *  ***  **  ** *****  *  **  **   **   ****   * **** * 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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