View Compilation Error

0_0_11624701_9491.cpp: In function `int main()':
0_0_11624701_9491.cpp:11: error: `memset' undeclared (first use this function)
0_0_11624701_9491.cpp:11: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11624701_9491.cpp:12: error: `itoa' undeclared (first use this function)
0_0_11624701_9491.cpp:16: error: `strlen' undeclared (first use this function)