View Compilation Error

0_0_21985845_13976.cpp: In function 'bool Intersect(Segment, Segment)':
0_0_21985845_13976.cpp:16:49: error: 'max' was not declared in this scope
     if (max(segment1.point1.x, segment1.point2.x) < min(segment2.point1.x, segment2.point2.x)) {
                                                 ^
0_0_21985845_13976.cpp:16:93: error: 'min' was not declared in this scope
     if (max(segment1.point1.x, segment1.point2.x) < min(segment2.point1.x, segment2.point2.x)) {
                                                                                             ^
0_0_21985845_13976.cpp: In function 'int main()':
0_0_21985845_13976.cpp:33:12: error: 'cin' was not declared in this scope
     while (cin >> n && (n != 0)) {
            ^
0_0_21985845_13976.cpp:79:9: error: 'cout' was not declared in this scope
         cout << sum << endl;
         ^
0_0_21985845_13976.cpp:79:24: error: 'endl' was not declared in this scope
         cout << sum << endl;
                        ^