W3School TIY Editor

#include <iostream> using namespace std; int main() { int myNum = 10; // 这是正数还是负数？ if (myNum > 0) { cout << "该数值是正数。\n"; } else if (myNum < 0) { cout << "该数值是负数。\n"; } else { cout << "该数值是 0。\n"; } return 0; }