Rounding a whole number integer
I have been trying to solve a problem that requires me to round a whole number integer and add up the 3 integers. The problem being that if the integers most right digit is 5 or higher it rounds to 10.Another would be 15 or higher it would round to 20. Also, the number range of 0 through 4 will be 0 and the the range of 10 through 14 will be 10. There is also a catch to it; which is that you can't change anything out of the "Enter your code area" area. First, I had the idea of using the if statement and have it search the numbers range but the output was off and the code was long, so I stopped. Then I thought of doing this static_cast<int>((a * 0.1) % 1); but was unable to compile. So, if anyone could give a beginner some advice or hints I would be very grateful and Thanks in advance.
#include <iostream>
using namespace std;
int main()
{
cout << "Enter three integers: ";
int a, b, c;
cin >> a >> b >> c;
int sum = 0;
//Enter your code blow:
//Enter your code above:
cout << "The sum of the integer is: " << sum;
return 0;
}
#include <iostream>
using namespace std;
int main()
{
cout << "Enter three integers: ";
int a, b, c;
cin >> a >> b >> c;
int sum = 0;
//Enter your code blow:
//Enter your code above:
cout << "The sum of the integer is: " << sum;
return 0;
}
Last edited on
you can round (not whole) numbers down, by converting floats to integers.
if you first add 0.5 to float it will be rounded the right way. for example 1.6+0.5=2.1, 2.1 rounds down to 2. 1.4+0.5=1.9, 1.9 rounds down to 1. to round a whole number you should first convert it to float (multiply by 0.1), then add 0.5, convert to integer and finally multiply it by 10.
if you first add 0.5 to float it will be rounded the right way. for example 1.6+0.5=2.1, 2.1 rounds down to 2. 1.4+0.5=1.9, 1.9 rounds down to 1. to round a whole number you should first convert it to float (multiply by 0.1), then add 0.5, convert to integer and finally multiply it by 10.
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