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Programming in D: The Ultimate Guide for Software Engineers

Advanced Arithmetic Operations on Integers

Explore advanced arithmetic operations on integers in D programming including negation, post-increment, post-decrement, and operator precedence. Understand how to combine operators effectively and write clear expressions using parentheses to ensure correct results and intent.

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Arithmetic operations with assignment

All of the operators that take two expressions have assignment counterparts. These operators assign the result back to the expression that is on the left-hand side:

D
import std.stdio;
void main() {
    int number = 10;
    number += 20;  // same as number = number + 20; now 30
    writeln(number);
    number -= 5;   // same as number = number - 5;  now 25
    writeln(number);
    number *= 2;   // same as number = number * 2;  now 50
    writeln(number);
    number /= 3;   // same as number = number / 3;  now 16
    writeln(number);
    number %= 7;   // same as number = number % 7;  now  2
    writeln(number);
    number ^^= 6;  // same as number = number ^^ 6; now 64
    writeln(number);
}

Negation: -

This operator converts the value of the expression from negative to positive or vice versa:

D
import std.stdio;
void main() {
    int number_1 = 1;
    int number_2 = -2;
    writeln(-number_1);
    writeln(-number_2);
}

It is different from subtraction because it takes only one operand. Since unsigned types cannot have negative values, the result of using this operator with unsigned types can be surprising:

D
import std.stdio;
void main() {
    uint number = 1; 
    writeln("negation on uint: ", -number);
}

The type of -number ...