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=  * ** **** 

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***  ** * ** *     *   *   *  * *  ** *  ********  **  *     **   
* **** * ****   * ****  ***  *

* *  ****  ***** *  ** 
if (cnt == n){
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}

int main()
{
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}
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Hidden content!
#include <stdio.h>
#include <string.h>

int main(){
 *  **   *  ** * **     ** **  **  c;
 **  **  ********    **  **  a[100],b[100];
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    }
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}
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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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  ** * ***  ****  **** *       * ***** * * ***** *  **   * *   ***  **  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);
** *** *  *** *  * * * * ** *    ** *  *
*  * * **  *  * * *** * * ****   *   * *

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**  *** **    ***   * *** *** *  **  *  **** *  **
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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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***     * ** * ** ***** ** **  ** * * *    **   *  ** ** *
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 *  * *     *** * *   ****  * **** ** *** * ** **  * *   *    * ********** *    *** ****  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);
*    *  ** *** **  ** **  * *** **** *   
  ** ******  ***  *  *  **** * **  ** * 
*     *  ** **     * ** ******* * **      * **   **   * 
 ** * *  *   ****** **  * * * *** ***** * 
  * * ** ** ** **  * * ****    * * **** ****  *  * *     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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