View Compilation Error

0_0_11003311_10525.cpp:3: error: `data' does not name a type
0_0_11003311_10525.cpp: In function `int main()':
0_0_11003311_10525.cpp:7: error: `a' undeclared (first use this function)
0_0_11003311_10525.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)