View Compilation Error

0_0_14912299_19937.cpp:3:11: error: '::main' must return 'int'
 void main()
           ^
0_0_14912299_19937.cpp: In function 'int main()':
0_0_14912299_19937.cpp:8:23: error: 'peintf' was not declared in this scope
    peintf("Enter n,m:");
                       ^
0_0_14912299_19937.cpp:12:32: error: 'sqrt' was not declared in this scope
           fact=n*1.0/pow(sqrt(n),i-1);
                                ^
0_0_14912299_19937.cpp:12:37: error: 'pow' was not declared in this scope
           fact=n*1.0/pow(sqrt(n),i-1);
                                     ^