Variable [MCQ] : Find Output of Program (Multiple Choice Questions)

Question 16
What will be the output of the following code ? 
int main()
{
        int num,OS_Solaris,OS_Windows,OS_HP-UX;
        printf("Enter the number (1-3):\n");
        scanf("%d",&num);
        switch(num)
        {
                case 1:
                        OS_Solaris = 20;
                        break;
                case 2:
                        OS_Windows = 30;
                        break;
                case 3:
                        OS_HP-UX = 40;
                        break;
                default:
                        printf("Hmm! only 1-3 :-)\n");
                        break;
        }
        return 0;
}
Consider num entered is 3.
A
OS_HP-UX = 40
will be executed.
B
Compile Error will make compilation unsuccessful,
C
Cannot Execute Switch Case Statement
D
None of these
Question 16 Explanation: 
Special Symbols are not allowed while declaring identifier.
Question 17
#include<stdio.h>
int main(){
    int M-PI=25;
    printf("%d",M_PI);
    return 0;
}
Find out error in the above code.
A
None of these
B
All Characters in the Variable should not be in Capital Case.
C
M-PI cannot be declared as it is One of the C Constant.
D
Variable Declaration is Illegal
Question 17 Explanation: 
Special Characters are not allowed.

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Question 16
What will be the output of the following program ? 
#include<stdio.h>
void main()
{
int var1=10;
  {
  int var2 = 20;
  printf("%d %d",var1,var2);
  }
printf("%d %d",var1,var2);
}
A
10 20 10 20
B
Run Time Error
C
10 20 10 garbage
D
Compile Time Error
Question 16 Explanation: 
Outer block can’t access variables declared inside Inner Block.
Question 17
Guess output of program - 
#include<stdio.h>
void main()
{
int var1=10;
  {
  int var1 = 20;
  printf("%d %d",var1,var1);
  }
printf("%d %d",var1,var1);
}
A
10 10 20 20
B
20 10 20 10
C
20 20 10 10
D
10 20 10 20
Question 17 Explanation: 
If same variable is declared inside inner as well as outer block then higher priority will be given to inner block.
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