# Date: Mon, 19 Dec 2005 18:14:13 -0800

# From: David Ellsworth <ellswort@nas.nasa.gov>

# Subject: Re: gawk number to string bug

# To: eggert@CS.UCLA.EDU, eliz@gnu.org

# Cc: arnold@skeeve.com, aschorr@telemetry-investments.com,

#         bug-gnu-utils@gnu.org, ellswort@nas.nasa.gov

# Message-id: <200512200214.jBK2EDuu020216@ece03.nas.nasa.gov>

# 

# Since you are taking my bug report seriously (which is really great),

# let me add some more fuel to the fire.  Consider this program:

# 

# BEGIN { x=2**60; for(i=60;i<=65;i++) { printf "2^%d= %s %d %g\n",i,x,x,x; x*=2}}

# 

# which prints out powers of two around 2^63.  On an Opteron (as well as

# an Itanium), you get

# 

# 2^60= 1152921504606846976 1152921504606846976 1.15292e+18

# 2^61= 2305843009213693952 2305843009213693952 2.30584e+18

# 2^62= 4611686018427387904 4611686018427387904 4.61169e+18

# 2^63= -9223372036854775808 9223372036854775808 9.22337e+18

# 2^64= 1.84467e+19 0 1.84467e+19

# 2^65= 3.68935e+19 3.68935e+19 3.68935e+19

# 

# On a Xeon, you get

# 

# 2^60= 1.15292e+18 1152921504606846976 1.15292e+18

# 2^61= 2.30584e+18 2305843009213693952 2.30584e+18

# 2^62= 4.61169e+18 4611686018427387904 4.61169e+18

# 2^63= 9.22337e+18 9223372036854775808 9.22337e+18

# 2^64= 1.84467e+19 0 1.84467e+19

# 2^65= 3.68935e+19 3.68935e+19 3.68935e+19

# 

# The 2^64 value for %d is probably also a bug since the outputs

# for 2^63 and 2^65 are reasonable.

# 

# - David

# 

BEGIN {

	x = 2 ^ 60

#	for (i = 60; i <= 65; i++) {

	for (i = 60; i <= 63; i++) {

		printf "2^%d= %s %d %g %o\n", i, x, x, x, x

		x *= 2

	}

}