Char Math Symbols

[zxry]

I'm new to C++ and need to write a program that reads and calculates math equations from a char string. My question: is there a way to convert a char math symbol such as '+' into a + the compiler can use in an equation?

Right now I'm using a bunch of If statements to handle this, but would like to know if there's a way to work the char sign directly into the equation.

i.e.

char num1 = '5';
char sign = '+';
char num2 = '2';

if (sign == '+')
{
int sum = (num1 - '0') + (num2 - '0');
// want to do somthing like: int sum = (num1 - '0') sign (num2 - '0');
}
if (sign == '-')

.... etc

Thanks.

[Ganon11]

Not that I know of. The way you're doing it is the way I would do it.

[JosAH]

@OP: you're talking about the rudiments of an expression interpreter. Google for
infix-expression and postfix-expression. The second form is easy to evaluate by
using a simple stack.

kind regards,

Jos