Should unsigned ints be used if not necessary?

Question

Should one ever declare a variable as an unsigned int if they don\'t require the extra range of values? For example, when declaring the variable in a for loop, if you know i

Answer 1

In almost all architectures the cost of signed operation and unsigned operation is the same. So efficiency wise you wont get any advantage for using unsigned over signed. But as you pointed out, if you use unsigned you will have a bigger range