View Compilation Error

D:\HDOJ\temp\2_14855_1027731_1036.cpp: In function `int main()':
D:\HDOJ\temp\2_14855_1027731_1036.cpp:24: error: `strupr' undeclared (first use this function)
D:\HDOJ\temp\2_14855_1027731_1036.cpp:24: error: (Each undeclared identifier is reported only once for each function it appears in.)
D:\HDOJ\temp\2_14855_1027731_1036.cpp:26: error: `strlwr' undeclared (first use this function)