Question

What is the value of  result after the following code executes?  
int a = 60;
int b = 15;
int result = 20;
if (a = b)
result *= 3;

		30
		20
		60
		10
		code will not execute

The numeric data types in C++ can be broken into two general categories which are

		integers and floating-point numbers
		singles and doubles
		real and unreal numbers
		numbers and characters
		numbers and literals

Which line in the following program will cause a compiler error?
1 #include <iostream>
2 using namespace std;
3
4 int main()
5 {
6 const int MY_VAL = 77;
7 MY_VAL = 99;
8 cout << MY_VAL << endl;
9 return 0;
10 }

		line 6
		line 8
		line 7
		line 9
		there will be no compiler error

What is the output of the following segment of code if the value  4 is input by the user?
int num;
int total = 10;
cout << "Enter a number from 1 to 10: ";
cin >> num;
switch (num)
{
case 1:
case 2: total = 5;
case 3: total = 10;
case 4: total = total + 3;
case 8: total = total + 6;
default: total = total + 4;
}
cout << total << endl;

		23
		13
		3
		0
		None of these

Answer 1

1. result = 60, if(a = b) is not a logical decision, it just assignment operation and it would be successful so the result will be multiplied by 3 which makes it value 60 from 20

2. Error on line 7 as the MY_VAL variable is read-only or constant and can not be changed

3. Total = 23, there is no break statement so it started at case 4 but it didn't stop there so next is case 8 and then the default case which increases the value of total by first 3, then 6 then 4 that is total of 13 and the initial value was 10 which makes it 23

If there is any doubt left, please do comment, I will try to get back on to reply as soon as possible