53 lines
2.2 KiB
Nim
53 lines
2.2 KiB
Nim
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echo "For 32 bits signed integers with overflow check suppressed:"
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{.push overflowChecks: off.}
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var a: int32
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a = -(-2147483647i32 - 1'i32)
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echo " -(-2147483647-1) gives ", a # -2147483648.
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a = 2000000000i32 + 2000000000i32
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echo " 2000000000 + 2000000000 gives ", a # -294967296.
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a = -2147483647i32 - 2147483647i32
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echo " -2147483647 - 2147483647 gives ", a # 2.
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a = 46341i32 * 46341i32
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echo " 46341 * 46341 gives ", a # -2147479015.
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a = (-2147483647i32 - 1i32) div -1i32
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echo " (-2147483647-1) / -1 gives ", a # -2147483648.
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{.pop.}
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echo ""
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echo "For 64 bits signed integers with overflow check suppressed:"
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{.push overflowChecks: off.}
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var b: int64
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b = -(-9223372036854775807i64 - 1i64)
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echo " -(-9223372036854775807-1) gives ", b # -9223372036854775808.
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b = 5000000000000000000i64 + 5000000000000000000i64
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echo " 5000000000000000000 + 5000000000000000000 gives ", b # -8446744073709551616.
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b = -9223372036854775807i64 - 9223372036854775807i64
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echo " -9223372036854775807 - 9223372036854775807 gives ", b # 2.
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b = 3037000500i64 * 3037000500i64
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echo " 3037000500 * 3037000500 gives ", b # -9223372036709301616.
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b = (-9223372036854775807i64 - 1i64) div -1i64
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echo " (-9223372036854775807-1) / -1 gives ", b # -9223372036854775808.
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{.pop.}
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echo ""
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echo "For 32 bits unsigned integers:"
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var c: uint32
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echo " -4294967295 doesn’t compile."
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c = 3000000000u32 + 3000000000u32
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echo " 3000000000 + 3000000000 gives ", c # 1705032704.
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c = 2147483647u32 - 4294967295u32
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echo " 2147483647 - 4294967295 gives ", c # 2147483648.
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c = 65537u32 * 65537u32
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echo " 65537 * 65537 gives ", c # 131073.
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echo ""
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echo "For 64 bits unsigned integers:"
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var d: uint64
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echo " -18446744073709551615 doesn’t compile."
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d = 10000000000000000000u64 + 10000000000000000000u64
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echo " 10000000000000000000 + 10000000000000000000 gives ", d # 1553255926290448384.
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d = 9223372036854775807u64 - 18446744073709551615u64
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echo " 9223372036854775807 - 18446744073709551615 gives ", d # 9223372036854775808.
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d = 4294967296u64 * 4294967296u64
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echo " 4294967296 * 4294967296 gives ", d # 0.
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