C++自学计划-if-08

例子：

int a = 10;
    int b = 20;

    if (a > b) {
        std::cout << "a > b" << std::endl;
    } else if (a < b) {
        std::cout << "a < b" << std::endl;
    } else {
        std::cout << "a == b" << std::endl;
    }

运行结果

a < b