How to resolve the algorithm Integer overflow step by step in the Swift programming language
How to resolve the algorithm Integer overflow step by step in the Swift programming language
Table of Contents
Problem Statement
Some languages support one or more integer types of the underlying processor. This integer types have fixed size; usually 8-bit, 16-bit, 32-bit, or 64-bit. The integers supported by such a type can be signed or unsigned. Arithmetic for machine level integers can often be done by single CPU instructions. This allows high performance and is the main reason to support machine level integers.
An integer overflow happens when the result of a computation does not fit into the fixed size integer. The result can be too small or too big to be representable in the fixed size integer.
When a language has fixed size integer types, create a program that does arithmetic computations for the fixed size integers of the language. These computations must be done such that the result would overflow. The program should demonstrate what the following expressions do.
For 32-bit signed integers: For 64-bit signed integers: For 32-bit unsigned integers: For 64-bit unsigned integers:
Let's start with the solution:
Step by Step solution about How to resolve the algorithm Integer overflow step by step in the Swift programming language
Source code in the swift programming language
// By default, all overflows in Swift result in a runtime exception, which is always fatal
// However, you can opt-in to overflow behavior with the overflow operators and continue with wrong results
var int32:Int32
var int64:Int64
var uInt32:UInt32
var uInt64:UInt64
println("signed 32-bit int:")
int32 = -1 &* (-2147483647 - 1)
println(int32)
int32 = 2000000000 &+ 2000000000
println(int32)
int32 = -2147483647 &- 2147483647
println(int32)
int32 = 46341 &* 46341
println(int32)
int32 = (-2147483647-1) &/ -1
println(int32)
println()
println("signed 64-bit int:")
int64 = -1 &* (-9223372036854775807 - 1)
println(int64)
int64 = 5000000000000000000&+5000000000000000000
println(int64)
int64 = -9223372036854775807 &- 9223372036854775807
println(int64)
int64 = 3037000500 &* 3037000500
println(int64)
int64 = (-9223372036854775807-1) &/ -1
println(int64)
println()
println("unsigned 32-bit int:")
println("-4294967295 is caught as a compile time error")
uInt32 = 3000000000 &+ 3000000000
println(uInt32)
uInt32 = 2147483647 &- 4294967295
println(uInt32)
uInt32 = 65537 &* 65537
println(uInt32)
println()
println("unsigned 64-bit int:")
println("-18446744073709551615 is caught as a compile time error")
uInt64 = 10000000000000000000 &+ 10000000000000000000
println(uInt64)
uInt64 = 9223372036854775807 &- 18446744073709551615
println(uInt64)
uInt64 = 4294967296 &* 4294967296
println(uInt64)
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