View Compilation Error

0_0_1620824_21025.cpp: In function `int main()':
0_0_1620824_21025.cpp:56: error: `cin' undeclared (first use this function)
0_0_1620824_21025.cpp:56: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1620824_21025.cpp:68: error: `cout' undeclared (first use this function)
0_0_1620824_21025.cpp:68: error: `endl' undeclared (first use this function)