View Compilation Error

0_0_8457800_13419.cpp: In function `int main()':
0_0_8457800_13419.cpp:125: error: `cin' undeclared (first use this function)
0_0_8457800_13419.cpp:125: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8457800_13419.cpp:146: error: `cout' undeclared (first use this function)
0_0_8457800_13419.cpp:146: error: `endl' undeclared (first use this function)