View Compilation Error

1024468_0_0_1105.cpp:2: error: `main' must return `int'
1024468_0_0_1105.cpp: In function `int main(...)':
1024468_0_0_1105.cpp:3: error: `scanf' undeclared (first use this function)
1024468_0_0_1105.cpp:3: error: (Each undeclared identifier is reported only once for each function it appears in.)
1024468_0_0_1105.cpp:3: error: `EOF' undeclared (first use this function)
1024468_0_0_1105.cpp:4: error: `getchar' undeclared (first use this function)
1024468_0_0_1105.cpp:18: error: `printf' undeclared (first use this function)