Basics

Arithmetic

Division, Modulo, Power

Integer division truncates toward zero, mod returns the remainder, and ** raises to a power.

Program

Play the program to compute a quotient, remainder, and square.

arithmetic.f90 
program arithmetic
    implicit none
    integer :: a, b, q, r, p
    a = 7
    b = 2
    q = a / b
    r = mod(a, b)
    p = a ** b
    print '(I0, A, I0, A, I0)', q, " ", r, " ", p
end program arithmetic
integer division `7 / 2` truncates to `3`.
mod `mod(7, 2)` returns the remainder `1`.
exponent `a ** b` raises `a` to the power `b`.