View Compilation Error

0_0_2544466_26645.cpp: In function `int main()':
0_0_2544466_26645.cpp:4: error: expected init-declarator before "scanf"
0_0_2544466_26645.cpp:4: error: expected `,' or `;' before "scanf"
0_0_2544466_26645.cpp:10: error: `a' undeclared (first use this function)
0_0_2544466_26645.cpp:10: error: (Each undeclared identifier is reported only once for each function it appears in.)