C++ — type of the division?

Question

I want to make sure that my understanding of the return type of C++ division,

int / int => return is int?

float / float => return is which type? float?

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Answer 1

You are correct in all cases. The rules for operations involving at least one floating point type are that if either type is a long double, the result is long double; otherwise, if either type is double the result is double otherwise the result has type float.

Arithmetic operations between two ints produce an int result.

The rules between other types are slightly more complex and can be implementation dependent; for almost all operations integer promotions mean that the operands are promoted to at least an int sized types producing at least an int sized result.