View Compilation Error

0_0_5181315_27999.cpp: In function `int main()':
0_0_5181315_27999.cpp:32: error: `a' undeclared (first use this function)
0_0_5181315_27999.cpp:32: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5181315_27999.cpp:32: error: expected `;' before '{' token