Which variables should I typecast when doing math operations in C/C++?

Question

For example, when I\'m dividing two ints and want a float returned, I superstitiously write something like this:

int a = 2, b = 3;
float c = (float)a / (floa         


        

Answer 1

Division of integers: cast any one of the operands, no need to cast them both. If both operands are integers the division operation is an integer division, otherwise it is a floating-point division.

As for the overflow question, there is no need to explicitly cast, as the compiler implicitly does that for you:

#include 
#include 

using namespace std;
int main()
{
    signed int a = numeric_limits::max();
    unsigned int b = a + 1; // implicit cast, no overflow here
    cout << a << ' ' <<  b << endl;
    return 0;
}