Temperature Range Shift (operator+ and operator<<)

You are adjusting an allowed temperature range by a delta.

Create a class TemperatureRange that stores TWO ints: lowC and highC.

Requirements:
1) Constructor TemperatureRange(int lowC, int highC)
2) operator+(int delta) returns a NEW TemperatureRange where BOTH lowC and highC are increased by delta
3) operator<< prints like: lowC-highC C
   Example: 20-25C

Do NOT write a main function.