Intrinsic Functions

Fortran has ~200 intrinsic procedures; most are elemental (work on arrays element-wise) and generic (work for any kind).

7.1 Numeric

abs(x), sqrt(x), exp(x), log(x), log10(x), sin(x), cos(x), tan(x), asin(x), acos(x),
atan(x), atan2(y, x), sinh(x), cosh(x), tanh(x), asinh(x), acosh(x), atanh(x),
mod(a, p), modulo(a, p), sign(a, b), dim(x, y), max(a, b, ...), min(a, b, ...),
aint(x), anint(x), int(x), nint(x), floor(x), ceiling(x), real(x), dble(x),
gamma(x), log_gamma(x), erf(x), erfc(x), bessel_j0(x), bessel_jn(n, x), hypot(x, y),
norm2(v), conjg(z), aimag(z), cmplx(x, y)
! Fortran 2023: sind, cosd, tand, asind, ... (degrees), sinpi, cospi, acospi, ...

7.2 Bit manipulation

iand(i, j), ior(i, j), ieor(i, j), not(i), ishft(i, n), ishftc(i, n), btest(i, pos),
ibset(i, pos), ibclr(i, pos), popcnt(i), poppar(i), leadz(i), trailz(i), shiftl(i, n), shiftr(i, n)

7.3 Inquiry & miscellaneous

present(arg), allocated(a), associated(p), size(a), shape(a), lbound(a), ubound(a),
len(s), len_trim(s), kind(x), huge(x), epsilon(x), is_contiguous(a), rank(a)
cpu_time(t), system_clock(count, rate, max), date_and_time(date, time, zone, values),
random_number(r), random_seed(), random_init(repeatable, image_distinct),
get_command(cmd), get_command_argument(i, arg), command_argument_count(),
get_environment_variable("HOME", value), execute_command_line("ls -l"),
move_alloc(from, to), transfer(source, mold)