This function retrieves machine integer constants that define the arithmetic used by the computer.

Function Return Value

IMACH(1) = Number of bits per integer storage unit.

IMACH(2) = Number of characters per integer storage unit:

Integers are represented in M-digit, base A form as

where σ is the sign and 0 ≤ xk < A, k = 0, …, M.

Then,

IMACH(3) = A, the base.

IMACH(4) = M, the number of base-A digits.

IMACH(5) = AM − 1, the largest integer.

The machine model assumes that floating-point numbers are represented in normalized N-digit, base B form as

where σ is the sign, 0 < x1 < B, 0 ≤ xk < B, k = 2, …, N and E min ≤ E ≤ E max. Then,

Required Arguments

I — Index of the desired constant. (Input)

FORTRAN 90 Interface

Generic:                              IMACH (I)

Specific:                             The specific interface name is IMACH.

FORTRAN 77 Interface

Single:                                IMACH (I)

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