Using Doubles

Iv created a calculator but it is only working for integers below is a function for adding 2 numbers

Code:

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num2 = atoi(buffer);
SetWindowText(hwndEdit,itoa(num1 + num2,buffer,10));

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num1 was read in earlier and num2 has been converted to an int from buffer which has just been read in.

but i would like to use doubles any suggestions please

Code:

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double atof(const char*); //std
char* _gcvt(double, int, char*); // non-std

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http://msdn.microsoft.com/

Since you are already using non-standard itoa I figured you might look into _gcvt if it or one of it's brothers are available.

So my code would be like this???

Code:

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num2 = atof(buffer);                          //convert the string to a double
SetWindowText(hwndEdit,ftoa(num1 + num2,buffer,10));        //convert the double back to a String

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i tried using that code and i had no luck any suggestions?

Quote:

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Originally Posted by jay kay

So my code would be like this???

Code:

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num2 = atof(buffer);                          //convert the string to a double
SetWindowText(hwndEdit,ftoa(num1 + num2,buffer,10));        //convert the double back to a String

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Where did ftoa come from? I mentioned _gcvt not ftoa. Mind the order of the parameters too.