View Compilation Error

0_0_2592112_1430.cpp:3: error: ISO C++ forbids declaration of `mian' with no type
0_0_2592112_1430.cpp: In function `int mian()':
0_0_2592112_1430.cpp:13: error: `pow' undeclared (first use this function)
0_0_2592112_1430.cpp:13: error: (Each undeclared identifier is reported only once for each function it appears in.)