View Compilation Error

0_0_3039661_4090.cpp: In function `int main()':
0_0_3039661_4090.cpp:12: error: `malloc' undeclared (first use this function)
0_0_3039661_4090.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3039661_4090.cpp:16: error: `memset' undeclared (first use this function)
0_0_3039661_4090.cpp:30: error: `free' undeclared (first use this function)