Final Exam 2 (20%)

Question

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

 

Answer 1

Hidden content!
  **** *     * *
* **     * ** ** * **

int main()
{
   *  **** char  **  ***  *
  **  *       * int i,c=0;
* ** *  ** * *   * *  **    * *     *  *   
 * **   **       *     *  *  ****      ***  **
  * * *          *   **   ***      ** 
**  **   * ** ** * {
** *  ** *   **  *      **   ***  ** * 
* *  *    ** ***  **  *   ****** {
*  *  ****   **** ** *   * ****  *     *     ****** ***  ** ** 
* *** *   *     ** * * * *   *      *****    *  *   *  *  {
** **                   *  * *   *   ** c=0;
*   ****  *****   *  ***   ***  **   **    ** * * *****  *  **  }
         *  ** ** *** *   *    *  **  ***  *** else    ** ** ***    * *  *  * 
** ***   *  *   *  **    *  **  *******  * * ** * *    *  * {
* ***    * * *   *    * * **  *    *    * **     * **   * *    *  * * ****   c++;
 **     **  * * *  ** *       *   **** *    ****     **  }
****** * * *  *** *  *  **   * *  }
  ***   *  *   * 
  * **   * * *  if(c==0)
*** ***   ******  * ****  * **     ** ** **   * ** is not a prefix of  * **     
 *** * ** ** ** else
   * **   * ***  **  *    * *         **  *   is a prefix of  * * * **  *  
***   *  *  ** }
 ** ***  *****  return 0;
}

Comments

prog.c: In function 'main':
prog.c:8:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&a);
           ^
prog.c:9:11: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
   scanf("%s",&b);
           ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

prog.c: In function 'main':
prog.c:10:6: warning: implicit declaration of function 'stlen' [-Wimplicit-function-declaration]
   if(stlen(b)>strlen(a))
      ^~~~~
/tmp/ccnE3ufV.o: In function `main':
prog.c:(.text+0x5b): undefined reference to `stlen'
collect2: error: ld returned 1 exit status

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Correct output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 2

Hidden content!
**** *   ********
*   *    ***  *    *    * *
int main()
{
*  *** * *   * *   ap;
  **  ***      *   *  * * *    **   || ap=a)
* *  * * ****** ***      **   * * * * * is a prefix of abcde\n");
 *     *** *  *
* ****    * *** 
 ** * *** *   *  **  *  ** * **** * ** is not a prefix of abcde");
** ****** ** ****  **   ** **  * * ***   * *    **   **  * **   **    * *** 0;
** ** *  * * ****  **  ** ** ** **         ** **** **    *** *   ******  *
  

Comments

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:10:12: warning: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^
prog.c:10:12: error: missing terminating " character
     printf("bc is not a prefix of abcde);
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
prog.c:11:12: error: expected expression before 'return'
            return 0;
            ^~~~~~
prog.c:12:12: error: expected ';' before '}' token
            }
            ^
prog.c:12:12: error: expected declaration or statement at end of input

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

---

prog.c: In function 'main':
prog.c:6:10: error: 'a' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
          ^
prog.c:6:10: note: each undeclared identifier is reported only once for each function it appears in
prog.c:6:17: error: 'z' undeclared (first use in this function)
   if(ap>=a&&ap<=z || ap=a)
                 ^
prog.c:12:12: error: expected declaration or statement at end of input
            }
            ^

Answer 3

Hidden content!
*       **  *  ** 
** *** *  *   ** *  * *

char p[1000],s[1000];
int i,pl,sl;

int test(char p[],char s[],int pl, int sl)
{
******** * *  *** ****  **  *** *** i<pl; i++)
* **  **  *****  ******    
* **  *      **  ******   ***** ** ** * **** ****     * (p[i]==s[i])
 * *** ** ** *  *  * *     *  * *  * **** *      * **  
 ***   *  ** ***    * * **     * *  ** ******      *  *  * ***  *  * ****  ** **  *  *******  **  
  *  **** ****   **  *   ***** ** *** * **** *      *  * *****    * ****   ** ** 
 * *** *         * * * *  ** ** *  **** * *  * * * *  * *  ***   ** **     ** * ** *****  **  *** *  * ** ** **** 1;
 * ***  ****** ** *** ** * *   ** ** * * * * *   ** *   * **   **** *   *  * *
* * *   ***  *      * *  *   **   * * **    *     ***    **
*  ** *  *  * *   * * * *  ** * ***** *** *  * * * * * ** * if(p[i]!=s[i])
 ** * *** *** ***  * *** ****  **    * **    ** * *** 
********  * *  ** ***    *    *   **  * *****   * * **  *    ***** **  * ***** ****  *** 0;
**   * ** **     *******   *    *  ** ** **** *  **    *
 ** * ** *    *  *        *
}


int main()
{
    * *   * * **
* ***** * *
 **** **  * * ",p);
 * ************ * *   * 
 *  *   *  *** **  

sl=strlen(s);
pl=strlen(p);


* * ** ********  && pl<sl)
{

  *  ** * *** *** * *  *  *   **   *** **   is a prefix of %s",p,s);
}else
{
printf("%s is not a prefix of %s",p,s);
}





}

Comments

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Wrong output
Case 2: Correct output

---

Case 0: Correct output
Case 1: Correct output
Case 2: Correct output

Answer 4

Hidden content!
#include<stdio.h>
#include<string.h>
int main()
{
 *    **  *  ***  * *    * * a[99],b[99];
    int l,i;
  * *  ** * ** * * *  *     *     * *
  * **  **  ***** *   *     *  *  ** 
*      *   * *   * **  *** **
* *** *  **    ***  *    ** *  **      *
    {
 ** * * **** *     *****      * *  *  ** **   * * *   *   ** *
******     * **    ** **     ***  *  **** ** *     ****
***  ** ** ** **      ** * *** **  * * *** *        ***   ** *  ** *  *** * *** *** **  * ***** a prefix of %s",a,b);
** * ***** *** * *   ***   ** **       *** **   **  **   *    ** ****** * ** **  * 
*  * ***** *** ** * ***    *  * *    *  *  **    *  
   ** * ** *   * ***  **** * * *   **** ** *   * ** 
  ** ** * **** *** *      ** ** **  *** **** *** *  *  
* ** *** ** **** *  ****   *  *** **   *** * *     * ***** *****  * * *    *** * * *      **  ***** not a prefix of %s",a,b);
* *  ***    ***  * **  ***  * ** *   *  *       *  **   **    ***** ** * **** *** ***  * ***
* *  * *    *   *  *  **  *   * * *** * **** **        *
    }


}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 5

Hidden content!
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int prefix(char a[100],char b[100]);


int prefix(char a[100],char b[100])
{
* **   **** ******  **  **     * i;
  *    **  **  **      ** *** count=0;
* **** **  **     * ****   len;

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

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


*  ******    ***** *  *** * ** * ** ***** 
  ** * *   ****  ** **        
* * ***  * *  ** *** *  * ** *    *** *    * * **    * 1;
**       ** ****** ***** *
    * **   ***  ***  *******  *** 

   return 0;
}


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


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

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

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

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


 ** **    * **  ** ** *   * ** 0;
}

Comments

prog.c: In function 'main':
prog.c:45:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&a);
               ^
prog.c:45:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&a);
                    ^
prog.c:46:15: warning: format '%[^
   ' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
     scanf("%[^\n]*c%",&b);
               ^
prog.c:46:20: warning: spurious trailing '%' in format [-Wformat=]
     scanf("%[^\n]*c%",&b);
                    ^

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

---

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 6

Hidden content!
* * *         * *   ****
* *    * ******* *  *

int  * *
{
 *    * **  *         * **   **  *  *  * **  no idea, I  ***  even do it in the  * * ** ** *   *
     * * ** *  ***  ****  * *  ** 0;
}

Comments

Case 0: Wrong output
Case 1: Wrong output
Case 2: Wrong output

Answer 7

Hidden content!
#include  * * * *  
#include *  *  ** * *  
#include ****** *****

int pref(char[],char[]);

int main(){

 * * ***     *      ** ****      * p[10],s[10];
**    *    *   *  * * num;

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

 * ** **  *  ** **      *  = pref(p,s);

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


 return 0;
}

int pref(char p[30],char s[30]){
* * ******   ***  ********* i;

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

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

}

Comments

prog.c: In function 'main':
prog.c:12:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:13:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
/tmp/cc0tBG5r.o: In function `main':
prog.c:(.text+0x1f): warning: the `gets' function is dangerous and should not be used.

---

prog.c: In function 'main':
prog.c:10:13: error: stray '#' in program
     int num;#include <stdio.h>
             ^
prog.c:10:14: error: 'include' undeclared (first use in this function)
     int num;#include <stdio.h>
              ^~~~~~~
prog.c:10:14: note: each undeclared identifier is reported only once for each function it appears in
prog.c:10:23: error: 'stdio' undeclared (first use in this function)
     int num;#include <stdio.h>
                       ^~~~~
prog.c:14:1: error: expected expression before 'int'
 int pref(char[],char[]);
 ^~~
prog.c: In function 'main':
prog.c:23:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:24:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^
prog.c: In function 'main':
prog.c:51:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(p);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~
prog.c:52:5: warning: 'gets' is deprecated [-Wdeprecated-declarations]
     gets(s);
     ^~~~
In file included from prog.c:1:0:
/usr/include/stdio.h:640:14: note: declared here
 extern char *gets (char *__s) __wur __attribute_deprecated__;
              ^~~~

---

prog.c: In function 'main':
prog.c:14:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&p);
             ^
prog.c:15:13: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[10]' [-Wformat=]
     scanf("%s",&s);
             ^

Answer 8

Hidden content!
 **    *   ** ***    
****** * ***  *  *   

int main()
{
** ***** * length1,     * * c;
 *    *** a[100];
* ***     b[100];
 ******    d[100];

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

****   ** *** * *  

  **  * ** * * ** 

 * **      **** *** *
** * *
  *   **   *  *  *** * ** *  * is a prefix of  * * * *
******  
 * * *** *  
   * *  * 
* *  ***** ** *  ** is not a prefix of  ** * * *  *** 
** ** *

}

Comments

prog.c: In function 'main':
prog.c:11:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&a);
          ^
prog.c:12:10: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
  scanf("%s",&b);
          ^
prog.c:24:11: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
           ^
prog.c:24:33: warning: format '%s' expects a matching 'char *' argument [-Wformat=]
  printf("%s is not a prefix of %s,a,b");
                                 ^

Answer 9

Hidden content!
    * ** *  * **    *
**    ** *  ****  * ** * *

int main()
{
 * *  ** ** *   ** *  * * *   str;
 * *     * **** ** ** *******  i, p, s;

  *  **     **   *  ** *   *   *  * *   *** &p, &s);

 *** ***  *** *     *   ***** (i<=0; &p; i++);
   **** **  ******   * **   *  * *
 **  *  *     *   **        * * *  **  * ** *  *  ** &p);
    *** ***  *  ** ** * **   ***   **    * ***
** *  ***   ** *  * * *    
  *    * * * * * **    * 

    **  * *   *** ** ****  **     0;
}

Comments

prog.c: In function 'main':
prog.c:12:7: error: expected '(' before '{' token
     if{}
       ^
prog.c:13:12: warning: too many arguments for format [-Wformat-extra-args]
     printf("abc", &p);
            ^~~~~
prog.c:14:13: warning: format '%d' expects a matching 'int *' argument [-Wformat=]
     scanf("%d");
             ^

Answer 10

Hidden content!
*  *      *  **** ** * *
*    *    * *   * *      
int main (){
char *** ***  
char   ** * 
*   * ** **** ***  * ** * * **
*** ****  **  **  * **  ****   ***** 
 * ** **  **  **   *  *** **
**** **  ** * ***  *** ** *** ***
 *  *  ** *** * **  * *
      *   * is a prefix of *   *  * * *** **  
}
else{
*   * ****  * is not a prefix of %s  **** * ** * *
}
  *  0;
}

Comments

prog.c: In function 'main':
prog.c:7:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string1);
         ^
prog.c:9:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[100]' [-Wformat=]
 scanf("%s",&string2);
         ^