View Compilation Error

0_0_5550083_11101.cpp:3: error: `main' must return `int'
0_0_5550083_11101.cpp: In function `int main(...)':
0_0_5550083_11101.cpp:3: error: `floatn' undeclared (first use this function)
0_0_5550083_11101.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5550083_11101.cpp:3: error: `sum' undeclared (first use this function)
0_0_5550083_11101.cpp:4: error: `n' undeclared (first use this function)