Example of std::numeric_limits.

numeric_limits.cpp

#include <iostream>
#include <limits>

template <typename T>
void test_limits() {
    T min = std::numeric_limits<T>::min();
    T max = std::numeric_limits<T>::max();
    std::cout << "min: " << min << std::endl;
    std::cout << "max: " << max << std::endl;
}

int main() {
    test_limits<int>();
    test_limits<long>();
    test_limits<float>();
    test_limits<double>();
    return 0;
}