View Compilation Error

451088_0_0_12154.cpp:3: error: `main' must return `int'
451088_0_0_12154.cpp: In function `int main(...)':
451088_0_0_12154.cpp:6: error: `scanf' undeclared (first use this function)
451088_0_0_12154.cpp:6: error: (Each undeclared identifier is reported only once for each function it appears in.)
451088_0_0_12154.cpp:11: error: `printf' undeclared (first use this function)