View Compilation Error

0_0_11703099_30439.cpp: In function `int main()':
0_0_11703099_30439.cpp:12: error: `itoa' undeclared (first use this function)
0_0_11703099_30439.cpp:12: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11703099_30439.cpp:13: error: `strupr' undeclared (first use this function)