View Compilation Error

1_556_1111_2589.cpp: In function `int main()':
1_556_1111_2589.cpp:4: error: `scanf' undeclared (first use this function)
1_556_1111_2589.cpp:4: error: (Each undeclared identifier is reported only once for each function it appears in.)
1_556_1111_2589.cpp:8: error: `memset' undeclared (first use this function)
1_556_1111_2589.cpp:15: error: `printf' undeclared (first use this function)