Consolidating function results?

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I have three functions; one returns a mathmatical operator, the other 2 return the operands. How do I consolidate these 3 variables into yet another function to display the correct result to test against the users response?

double get_result(char* operator, double operand1, double operand2)
{
//define your function here: a switch statement with cases for each operator would be one choice
}


cout<<get_result( get_operator(), get_operand1(), get_operand2());