View Compilation Error

1_556_361_11008.cpp: In function `int main()':
1_556_361_11008.cpp:7: error: `MAX' undeclared (first use this function)
1_556_361_11008.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
1_556_361_11008.cpp:16: error: `a' undeclared (first use this function)
1_556_361_11008.cpp:16: error: expected `;' before "if"