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()
{
 *  * **   ****** * s1[100], s2[100];
* ***   *  *    * *  i,j;

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

***  ** *   ***** *   ****   ****  **    **** ** *  * *   is a prefix of %s", s1,s2);
  * ** *  * * ****   * * * *   ** * ****  *    * * 
    **    *  ** * ** * ** * * ** * * ** ** ***   * 
* **** ** * *  ****     * ** **  *** *** ** * * ** *   * * ***      *  ** *    *** 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 not a prefix of %s",a,b);
** *       *  **  *  *  *   **  *** *  **** * *   *  ********   ** *  *** * **  **   *  * *  *  ***  *   
   ***** *  * *  ****  * ** ***   *** * **   ** ***  * *   ***     *  *  **  *
* *** *     * * **** *  * *  * * * ** ** ** *  * * **   *  **    *      * *   ***   *   if(c==strlen(a)-1)
******    *****  **   ***** *  *** *   * *  *  * ** ** ** ** **   ***  * *  * ** *    ** * *     *  * *   **  * ** 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;
  ***   * ** *   ***** *  * *
*  **  **   ***** ******   * ** ** **   *
* * *****  *   ****  * *** * *  **** 
*** **   ** **   ** **   ***  ** ** ***** *  *** *** *  *  * * ** * * *  * * is not a prefix of %s",a,b);

    }
* ** * ***  ****  *  * *   if(l1<=l2){
   **** ***  *  ******* * **  * *   *** * *** ***   ***** prefix=1;
**  ****      *    *  ** * ** ** *           ****    *  * i=0;
  *  ** *** * **  *** *    *  ******* * **  * *  * * **  ** **   * *  ****
*** * *  * * * * **     * * **   *   ** *  * * *   ** * * * *    **  **    *  * (a[i]!=b[i]){
****** ** *  *    * ***  ********** * *    * **  ****      ****   * ***      ****  * **  *   *  *    *  * ** *  ** ****  *   *
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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);
               ^
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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;
 *  ** ** *  *  *   ** ******   *   * *
  *   * *    *****   *** **  ****** ****** **
 *  *      *   ** ***    *   ***  **  **  *   **********
  *   *** * *    *   *** **  * 
** *   * *   *** *  **  **  **  * *   *****     *   * (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;
}
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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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