View Compilation Error

1030060_0_0_18031.cpp: In function `int main()':
1030060_0_0_18031.cpp:15: error: `scanf' undeclared (first use this function)
1030060_0_0_18031.cpp:15: error: (Each undeclared identifier is reported only once for each function it appears in.)
1030060_0_0_18031.cpp:18: error: `puts' undeclared (first use this function)