View Compilation Error

0_0_6860756_32404.cpp:3: error: `main' must return `int'
0_0_6860756_32404.cpp: In function `int main(...)':
0_0_6860756_32404.cpp:5: error: expected init-declarator before "scanf"
0_0_6860756_32404.cpp:5: error: expected `,' or `;' before "scanf"
0_0_6860756_32404.cpp:5: error: stray '\' in program
0_0_6860756_32404.cpp:6: error: `b' undeclared (first use this function)
0_0_6860756_32404.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)