知识点:分支控制:分支控制if...else...的嵌套 #include <iostream> using namespace std; int main() { int a, b, c; while (cin >> a >> b >> c) { if ((a + b > c) && (a + c > b) && (b + c > a)) { if ((a == b) && (b == c)) { cout << "Equilateral triangle!...