Final Exam 2 (20%)

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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

 

[Exam] asked in Final Exam
ID: 42299 - Available when: 2018-01-17 14:00 - Due to: Unlimited
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Hidden content!
#include ****  ** **
#include **    ** ****** * 
****    * * *  *** ***
       *  ***     *  * *

int prefix(char a[], char b[]){
int i, j,n;
int cnt=0;

n=   *    ****** *

* * * ** ****     ***   ** ***    ** *
         * * *  ** ** ***    **  == b[i]){
*   * *   *  **     **** * *** * * **  ******* ***     *   ** 
 **** ** *  **   **  ***** * *

*   **  ** *  ** ***
if (cnt == n){
 *     *      *  ** *    *      * ** * *  * * * * ** * *   1;
* *** **  * ** *    ** * ***   ***** * ** *    **  *    
*     ** *  **       * ****  *
  **  **** **    * ***      *    ****  **  * * *  *  *   0;

}

int main()
{
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 * ** *** *  *        i,j;

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 * *  ***  *    *    (prefix(s1, s2)){

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****  ** ** * *  *   *      **  * ***  *  *  **   *
** *  **  * **** *  *  * **  *  **** ****  **  ** *** *  *** *******  * is not a prefix of %s", s1,s2);



}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main(){
***   ***     **   *  * *** *   c;
**** *    * ** **** * *  ***** a[100],b[100];
** *  ** *  ** *  *   *   ** ** *    %s",a,b);
* ***  *   * *****  * *** * ***  *  * *   ** **
 ** ** * * * ***      *  * *  ****  *  * **   **   ***  0;
*  ***   ** * *      * ** **   ****    ***** %d",strlen(a),strlen(b));
**    ***  * ** **  * ** ** *  *** *** ** * *
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*   *   * *  *  **   *     *   * ******  *** * * *    ******    ***** ** *      *  ***  * **  ** *  *  **  *    * is a prefix of %s",a,b);
    }
* *       * *   * ** ** *  ***   * 0;
}
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Hidden content!
#include <stdio.h>
#include <string.h>
int main()
{
   * ***   ** * * *     ***  *  n,count;
 ** *  *    * *  ****  **        *****  ***    *  ** 
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 **** ******  *   ** * *  * *

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** * ******  *** ** **    * ***
   * **   ** *   *      *  * ** **   **   ***** ** *  * ** * *   * is not a prefix of %s",a,b);
*       ** * *  *   ** 
 *   ** **  * **   *   **** *   0;
}
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prog.c: In function 'main':
prog.c:8:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s %s",&prefix,&word);
             ^
prog.c:8:16: warning: format '%s' expects argument of type 'char *', but argument 3 has type 'char (*)[100]' [-Wformat=]
     scanf("%s %s",&prefix,&word);
                ^
prog.c:10:15: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     for(i=0;i<strlen(prefix);++i)
               ^~~~~~
prog.c:10:15: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:10:15: note: include '<string.h>' or provide a declaration of 'strlen'
prog.c:18:6: error: expected '(' before 'printf'
      printf("%s is a prefix of %s",prefix,word);
      ^~~~~~
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Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
** **    *****  ***  *****  a[100],b[100];
 ** *  * *  ** **   * ** * * * *   ** * *** * *   
    int l1,l2;
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 *****    * ** ***    ****  *** 
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*  *** *** *  **** * *   *       * * **  ****** **   ****** * **    is not a prefix of %s",a,b);

    }
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****    *   *   *      *  *****   * **  ** *  *  ** * * *  * *** **     * **   ***** * *   *


* *****    ** *  *   ** *   ** *** *   *    ** ***     * 
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  * **  ** ** ** ** ** *  **  **   ** *  * ***  * ****   * **  * * * * *   *  *  *****   is not a prefix of %s",a,b);
**** *  **   ***  *    ** * ** * *  * **  **    * * * ***
* *   * * **** ****  ** **   * ** *      ****  *    **   *
* **** * *** *   ***** ** * **  *  *    *** *   **** *    **  *   is a prefix of %s",a,b);


    }


}
answered by (-329 points)
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prog.c: In function 'main':
prog.c:5:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
             ^
prog.c:5:15: warning: format '%s' expects argument of type 'char *', but argument 3 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
               ^
prog.c:7:8: warning: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
     l1=strlen(a);
        ^~~~~~
prog.c:7:8: warning: incompatible implicit declaration of built-in function 'strlen'
prog.c:7:8: note: include '<string.h>' or provide a declaration of 'strlen'
commented by (4.3k points)
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prog.c: In function 'main':
prog.c:6:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
             ^
prog.c:6:15: warning: format '%s' expects argument of type 'char *', but argument 3 has type 'char (*)[100]' [-Wformat=]
     scanf("%s%s",&a,&b);
               ^
commented by (4.3k points)
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Hidden content!
#include<stdio.h>
* * ***  * *   **
int main(void)
{

*** * *********   *  ****     pre[100];
 *** *  *     *   **  ** * * *   word[100];
**   ******    ***  ** *  ** **   ** * ** ****** %s",pre,word);
** *      *** * ****    * * *  ** **  ** 
 ** **** **** * ***    *    *** * ***  *

*  **     ****   *** ** ***  i;
*  ****        * *** ** **** * * *   ** **** *   *  *
 **    *  ***   ***** *   
 *   * ** ** * ***   * * **  * *  * **** *     * ****** *  
  **   * **  * **** *** *    ** ****    * * **  ****** **  *
****  ** ***    * *   *   ***** ****  *    ******** **     *** * ***  **  *    * *****  ***  ***   is not a prefix of %s",pre,word);
  ****** * * ** *     **  **  **   ****  * * ***    ****   *** * *   *   ** **** *** 0;
  *** ****  *** * ** ** **  * ** **   *** *  *  

**   **** ****    ** * * *  
printf("%s is a prefix of %s",pre,word);
return 0;
}
answered by (-249 points)
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prog.c: In function 'main':
prog.c:8:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s",&pre);
             ^
prog.c:9:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s",&word);
             ^
commented by (4.3k points)
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prog.c: In function 'main':
prog.c:8:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s",&pre);
             ^
prog.c:9:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%s",&word);
             ^
commented by (4.3k points)
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Hidden content!
#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main ()
{
  *   *** *****      * *   pre [100],a[100];
  *   * ***  *** *  * * ** * n ,i;
 * ** ******** **    ****  *  **     **  
 ** ***       * **    *  **       
   *   *  *         * * ***   **** ***   ** ***  **** 
*  ** **  * * **  *  
 **** *** *** ** *   *** * **** ** * ** * **  ****   ** ** (n=0;n<strlen(pre);n++)
*** * *       ** *** * ** *  **  * *  * ** * ** * *  *
 *   *** *  *   ***        * * *  ****  ** * ****   **    * ** * *   **  *  ***** *  (pre[n]==a[n])
 **  **    * *** ** * *  ** **  * * *             **  *  *** ** *** ** * * ** *   ** **   * is a prefix of %s",pre,a);
**  ** *  *  ** * **  **  *** ** ** ****** * *  *  * *  *  *  *   * *  **    *
** ***      *** *** ** * **   ** **  *   ** * ** *  ** *******  ** *     * **   ***  **  *    * ***** ***    * * *   * is not a prefix of %s",pre,a);return 0;
****  **   * ***   ******
 *  * ****** * * *  * **** ******* *   **  * *  **    ** **   **** **     * **    *** 

***   ***** *     *     * *** ** 0;
}
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Hidden content!
#include <stdio.h>
#include   * **  * ***   
#include * * *** *** 

int main()
{
 * *  ** *****  *  **  ***** * * * a[100];

   * **  ** *    *  *  *  ** b[100];

 **  ***   **    **     **   *  ** **** %s", a, b);

****   * *     **   **   **** len_a = strlen(a);

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

* ****  * * *  **** *** * * * *  flag = 1;

***           * * *  *  * * = 0; i < len_a; i++)
 * *  **** * *******   ** *
* * *   * *  **  * *****   ** *  * **   ** **    *****  != b[i])
  ***  ** **** *****   * ***   **   **  * ***** ** * * ****
 * **** ** ** ***  ***  ** *** ***   *  * *   **** **** * **    * * **    * * *   = 0;
   **** ** * *   **   **  * **   **  ** *   *** * *  **** *
 ** **  ***   *  ***   * **** *

    *  * ** **** * ***    * *** == 0)
   **     **    ** *      ***   ****
   *** *    **  *    * ** ****  ** *   ***  ** **  * *   * ** ***  is not a prefix of %s", a, b);
      * *** **   *     
  * ***  ***   *   * **** * *** 
* * * **        **  *** ******
***     **** * *  *  *****  *  ** * ** **     *  **   *   **  *** is a prefix of %s", a, b);
*      * *  *  *** *** ** **
*   * *****  *** *    ***** **** *** * 0;
}
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Hidden content!
#include<stdio.h>
*  *****     ****     *
int main()
{
** *   ***** **     ** **  *   i,n;
 *****  ** ** **   ******  **** p[100],s[100],a[100]={};
* *  **   * **   * ** *     ** *   *    %s",p,s);
 *** *** ********   ***** * 
*  *  * ** **    ** ** ** * **** 
 ** ****    *   ****  **  *   * *   *   *  * * *
*** ****     *   ***** * **   * ** *   *
* *** ****  ***  *  *   * *    ** *  ** * ** *  *  ************  ** is a prefix of %s",p,s);
* * *     *   ****  ****  ***
* * * **  ***** **    ** **** *    
  ******  *  **     **     * *****  *     *  **** * *  *** * **     is not a prefix of %s",p,s);
  *** * ** *   **   *     **
    *    * ****  **   *  * ******** ** ** **  *** ****  ***
   * **   ** *****     *   * * 0;
}
answered by (54 points)
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Hidden content!
#include<stdio.h>
#include<string.h>

int main()
{
    int i;
    char a[100];
    char b[100];
* *  * ***   *****   **     *  *  *   * ****  ***
    scanf("%s",b);
    for(i=0;i<strlen(a);i++)
* * * *  **    * * ** ** ****  *     *   ** ****
*  * ** * *  **  ***  *** *    *  * * **  ** * ***** * *   ** * *    *   *** **   * *   != b[i])
* *   *   ** * * **  ** ** ****  **** ***    ****    *   *    *   * ** ** *    ** * **** ***   *** * *** * **** *** * **  
   * ****  *** * ******  *** *   * *  * * * *   * **  ***    *    *   * * ****  ****    * ******  * ** *******  *      *** * ***  *** ****  * *    *** ***  is not a prefix of %s",a,b);
* *  ******* ***** * * * * ** ****  * ** **  *    *   ******* *  ***   *   *  **   *  * * **  ***  **  * ** *  * *** * * *  * * * * 
**     * * **    *** *      * *   ** ****** *    ** *    * **** ***  *  * *** *  *  ***  ** ***** *  *****
*   *   *  * *****  *   ***** *    * ** *** *  ***** ***  **** * *   * * * **  ** *****   *****    ** * == b[strlen(a)-1])
   ** *   **  *******  *    *   ** ** * * * ** ***  *  *  *  ***     *  ******   *   *    *   *  * * * **    *  
   **** *   *   ****** *** * **** *        ** *  **         *  *   **  ***  *   ** **  ** **   ** ***  ******* **** ** **  *** * ** * * *  * *    is a prefix of %s",a,b);
** *  *     ** * *  ****** * *     *** *    ***  *      ****  * *  * ****   * **  ** **    ***  *** **  * *  ** ***   *   **  ** 
*   *   * *  ** *******  * ****   ** *  **  *****    *********   *** *      * * * ***   ** * *** * *  *    * **
* **** * * ***   *  ** * *  *  ** * ***    * * **    
}
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Hidden content!
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define n 100

int aa(char a[],char b[]){
  *   *    ***** * ** * *    *  ******* * i;
 * **   **** ***** *** * **    **  * ** (a[0]!=b[0]){
*    * *       ** *     **   *      ** *    ******* ** **   *** 0;
**   * *   **** *  ** * **   * **  *** 
    *  ***   *      ****     ***   * * *
* * ** * ***  *   *      *   ***** *    **  **    *    *   **** ** ** **  a[i]==b[i])
** * ***  *  *    ** *    **** * *  ***  * * *    
* ** *  * *    * * *  **  *** *  * ** **** *** **  *  **   *   *     *  *  ** * **  1;
* *  ** ***  * *   *   ** *   ** *  ******* *   ***   ** **   *** * * * ** 
*  **  * ** **** ****        * *  **  * * *   *    ***  
  *  *  ****  * * * *  * *  *  ***  **   **
* ****  *  *  **** ***  * **  * * * * 0;

}

int main(){
****  *  * * ** ***    **** c[n],d[n],e[n];
*  **** ******      *  ****  i;
             *   ** * * **  ****** ***** %s",c,d);

 **** * *   ** ** *  *** *  *  * ***
 ** ** ***      *  * ** **   *  ***  ** *** *    * *    *** * is a prefix of %s",c,d);

      * *** *    ** * *     ***
*   ** * **  **** * ** *   **   **** * ** **    *  * *  is not a prefix of %s",c,d);


}
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