View Compilation Error

90598_0_23655.cpp:3: error: `main' must return `int'
90598_0_23655.cpp: In function `int main(...)':
90598_0_23655.cpp:5: error: `scanf' undeclared (first use this function)
90598_0_23655.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
90598_0_23655.cpp:7: error: `printf' undeclared (first use this function)