If anyone has any experience with programming, specifically C++, can you help me with a simple script error?

Ok, so my calculator script works at first, when it asks for 1 number, then when it asks if I should add, subtract, etc, the second number is automatically set to a whack number. please help :D

My script (first part, i think the error is at the end, plus I just copy and pasted my script over for -, *, and /):
#include<iostream>
using namespace std;

int main(void)
{

system("TITLE My little Calcy, FO");
system("COLOR 2");
char cChar;
double dfirstnumber;
double dsecondnumber;
char cDoagain;

do
{

system("CLS");
cout << "Insert the first number"
<< endl;
cin >> dfirstnumber;
cout << "Enter the operation you would like to complete"
<< " (+,-,*, or /)" << endl;
cin >> cChar;

cout << "Enter 2nd number, hurry up also, I don't have all day"
<< endl;

switch (cChar)
{
case '+' :
cout << "The answer is..." << dfirstnumber << " + " << dsecondnumber << " = " << (dfirstnumber + dsecondnumber)
<< endl;
break;

When you asked for the second number, you forgot to read in their answer? cin >> dsecondnumber?

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