0_0_27163484_2961.cpp:3:11: error: '::main' must return 'int' void main() ^ 0_0_27163484_2961.cpp: In function 'int main()': 0_0_27163484_2961.cpp:8:3: error: 'c' was not declared in this scope c = 4*pai*a*a*a/3; ^