View Compilation Error

0_0_2189999_25696.cpp:3: error: expected constructor, destructor, or type conversion before "int"
0_0_2189999_25696.cpp:3: error: expected `,' or `;' before "int"
0_0_2189999_25696.cpp: In function `int main()':
0_0_2189999_25696.cpp:8: error: `a' undeclared (first use this function)
0_0_2189999_25696.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2189999_25696.cpp:19: error: `f' undeclared (first use this function)