View Compilation Error

0_0_3045429_11473.cpp: In member function `void HighMutiply::display()':
0_0_3045429_11473.cpp:80: error: `cout' undeclared (first use this function)
0_0_3045429_11473.cpp:80: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_3045429_11473.cpp:115: error: `endl' undeclared (first use this function)
0_0_3045429_11473.cpp: In function `int main()':
0_0_3045429_11473.cpp:143: error: `string' undeclared (first use this function)
0_0_3045429_11473.cpp:143: error: expected `;' before "s1"
0_0_3045429_11473.cpp:144: error: `cin' undeclared (first use this function)
0_0_3045429_11473.cpp:144: error: `s1' undeclared (first use this function)
0_0_3045429_11473.cpp:144: error: `s2' undeclared (first use this function)