Rust/Variable/Type/Scalar/Integer

• types
  • Table 3-1: Integer Types in Rust

    Length	Signed	Unsigned
    8-bit	i8	u8
    16-bit	i16	u16
    32-bit	i32	u32
    64-bit	i64	u64
    128-bit	i128	u128
    architecture dependent	isize	usize

• signed integers use Programming/Two's Complement
• isize and usize
  • flexible: 64 bits if you’re on a 64-bit architecture and 32 bits if you’re on a 32-bit architecture
  • Rust/isize is the signed integer that fits on whatever computer is running the code
  • Rust/usize is the unsigned integer that fits on whatever computer is running the code
• Rust/Error/Panic will occur if you assign a value outside of the capacity
  • Rust/Compile/Debug mode will check for this
  • Rust/Compile/Release will NOT check for this
    • instead, it will silently perform Programming/Two's Complement/Wrapping
    • mitigations
      • Wrap in all modes with the wrapping_* methods, such as wrapping_add.
      • Return the None value if there is overflow with the checked_* methods.
      • Return the value and a Boolean indicating whether there was overflow with the overflowing_* methods.
      • Saturate at the value’s minimum or maximum values with the saturating_* methods.
• see also
  • Data Types - The Rust Programming Language