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


    }


}
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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);
               ^
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Hidden content!
#include<stdio.h>
     *     *    * ***
int main(void)
{

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

*  * * *  ** * *** **** ** *  ** i;
*  *** *   *   *** ** ** ** ***       * *   *
**       **  * ***    * ***
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   * **    ***  *****  **  * *   ** * * **** ** **** * * * * 
 *  **   **    * **   *   *  *    *   ***  *   ** ** ***** *** ** ****  *  **    * * 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;
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**** * **    ***     *   *  * **    ***** *   * * *   **   *  *  * * * *    * *   **  (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++)
* *  *      ****** *    
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     *     *****    *   *  *  * *   ***  * *  **   **
* * *  * *   **   * *   ***  *     * ***** **  ******* *    * * * *  * * * * * *** **   = 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);
         ** * ** * **** * **   ** 
    * ***  **      ** ** *  ****   
 *  ****  *   **** **  * **** *  *  ***   * **  
*****  * *  ** *   *  **  ***  * **  *  **
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   ******* **     ** 
** **   **** *  **   *   *  *
 ** * *         ****   *** *   ***** **  **** ** ***** ***   *  ** * **    *  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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