#include <iostream> using namespace std; int main() { int a, x, y; cout << "请输入数a: "; cin >> a; cout << "请输入区间的起始值x: "; cin >> x; cout << "请输入区间的结束值y: "; cin >> y; if (a >= x && a <= y) { std::cout << "yes"; } else { std::cout << "no"; } return 0; }