The range of reals is -(10)127 to (10)127 with a precision of 16 significant digits.

You can use decimal literals anywhere where a real is expected. A decimal literal is the decimal written directly in the code, for instance 2.123876. The range of reals is shown above, and all reals in this range can be used as literals in X++.

Real literals can also be written using exponential notation. Examples are:

real r;
;
r = 1.000e3;
r = 1.2345e+3;
r = 1.2345e+03;
r = 1234.5e40;
r = 1.0e; // Means 1.0E1

X++ performs automatic conversion of reals to Booleans, enums, and integers in expressions, depending on the result of the expression.

If the result is an integer or the operator is an integer-operator, reals are converted into integers. If the result is a Boolean, reals are converted to Booleans, and so on. For example:

void main()
{
    //Declares a variable of type integer with the name exprValue
    int exprValue;
 
    //Declares a real variable with the name area
    real area = 3.141528;
    ;
    exprValue = Area/3;
}

The expression Area/3 is a real expression because division is a real operator, and the result is 1.047176. This result is automatically converted (actually truncated) to an integer with the value 1, because exprValue is an integer.

Reals can be used in all expressions and with both relational operators and arithmetic operators as shown in the following example:

void myMethod() 
{
    // Two real variables are declared and initialized
    real i = 2.5, j = 2.5;
    ; 
 
    // j is assigned the result of j * i, so j=6.25
    j = j * i; 
 
    if (j > (i * 2)) // If j > 5 
    {
        print "Great"; // "Great" is printed
    }
    else 
    {
        print "Oops"; // else "Oops" is printed
    }
}