Need some help with tricky C++ problem

Given single character codes for the colored bands that mark a resistor, compute its resistance in ohms. The color codes are as follows:

COLOR CODE
Black 0
Brown 1
Red 2
Orange 3
Yellow 4
Green 5
Blue 6
Violet 7
Gray 8
White 9



If the integer codes of the bands (in order) color1, color2, and color3, then the resistance in ohms is:

Resistance=(10*color1+color2)*10^color3

Sample program run:

The colored bands are coded as follows:

Color Code
Black -> B
Brown -> N
Red -> R
Orange -> O
Yellow -> Y
Green -> G
Blue -> E
Violet -> V
Gray -> A
White -> W

Enter three color codes: ERO

Resistance in ohms: 62000.0

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