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);
         ^