0_0_20878808_21445.cpp:1:1: error: 'define' does not name a type define PI 3.1415927 ^ 0_0_20878808_21445.cpp: In function 'int main()': 0_0_20878808_21445.cpp:8:32: error: 'PI' was not declared in this scope printf("%.3lf\n",n*n*n*PI*4/3); ^