#include <iostream> using namespace std; int main() { int a = 21; int b = 10; int c ; c = a + b; cout << "Line 1 - c 的值是 " << c << endl ; c = a - b; cout << "Line 2 - c 的值是 " << c << endl ; c = a * b; cout << "Line 3 - c 的值是 " << c << endl ; c = a / b; cout << "Line 4 - c 的值是 " << c << endl ; c = a % b; cout << "Line 5 - c 的值是 " << c << endl ; c = a++; cout << "Line 6 - c 的值是 " << c << endl ; c = a--; cout << "Line 7 - c 的值是 " << c << endl ; return 0; }