View Compilation Error

0_0_9597121_17194.cpp:3: error: `main' must return `int'
0_0_9597121_17194.cpp: In function `int main(...)':
0_0_9597121_17194.cpp:8: error: `an' undeclared (first use this function)
0_0_9597121_17194.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_9597121_17194.cpp:9: error: `a' cannot be used as a function