12.2 Integer Overflow

In practice many portable C programs assume that signed integer overflow wraps around reliably using two's complement arithmetic. Yet the C standard says that program behavior is undefined on overflow, and in a few cases C programs do not work on some modern implementations because their overflows do not wrap around as their authors expected. Conversely, in signed integer remainder, the C standard requires overflow behavior that is commonly not implemented.

• Integer Overflow Basics: Why integer overflow is a problem
• Signed Overflow Examples: Examples of code assuming wraparound
• Optimization and Wraparound: Optimizations that break uses of wraparound
• Signed Overflow Advice: Practical advice for signed overflow issues
• Signed Integer Division: INT_MIN / -1 and INT_MIN % -1