#include #include int main(void){double x, y;printf("请输入x=\n");//scanf_s("%lf", x); 这个是你写的scanf("%lf",&x);if (x < 0){y = pow(x, 5) + 2*x + 1 / x;}else{y = sqrt(x);}printf("y=%.2f", y);return 0;}这样就可以了