读程序,请选择正确的选项填入下划线位置 void swap (int a, int b){ int temp; temp = a; a = b; b = temp; } int main(){ int x = 2, y = 3; swap(x, y); printf("x=%d, y=%d", x, y); return 0; } 请选择正确的输出结果:___________
【单选题】A distant astronomical object (a quasar) is moving away from us at half the speed of light. What is the speed of the light we receive from this quasar?