View Compilation Error

D:\HDOJ\temp\2_14855_1057565_14265.cpp: In function `int main()':
D:\HDOJ\temp\2_14855_1057565_14265.cpp:7: error: `cin' undeclared (first use this function)
D:\HDOJ\temp\2_14855_1057565_14265.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
D:\HDOJ\temp\2_14855_1057565_14265.cpp:25: error: `cout' undeclared (first use this function)
D:\HDOJ\temp\2_14855_1057565_14265.cpp:25: error: `endl' undeclared (first use this function)