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In C, signed integer overflow occurs when an arithmetic operation results in a value that exceeds the range that can be represented by the signed integer type. This leads to undefined behavior, meaning the result of the operation is unpredictable and can vary between different compilers and platforms1.
Example of Signed Integer Overflow
Consider the following example in C:
#include <stdio.h>int main(void) {int x = 2147483647; // Maximum value for a 32-bit signed integerint y = x + 1; // This will cause an overflowprintf("x = %d, y = %d\n", x, y);return 0;}In this example, x is initialized to the maximum value for a 32-bit signed integer, which is 2147483647. When we add 1 to x, it causes an overflow because the result (2147483648) cannot be represented by a 32-bit signed integer. The behavior of this operation is undefined, and the value of y can be unpredictable2.
Explanation of Overflow Behavior
c - What is signed integer overflow? - Stack Overflow
Nov 6, 2017 · "Signed integer overflow" means that you tried to store a value that's outside the range of values that the type can represent, and the result of that operation is undefined (in …
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How to Avoid Integer Overflows and Underflows in C++?
Apr 6, 2023 · Learn what integer overflow and underflow are, and how to prevent them in C++. See examples of signed and unsigned int, long long, and LL data types, and how to use them …
Integer overflow - Wikipedia
The register width of a processor determines the range of values that can be represented in its registers. Though the vast majority of computers can perform multiple-precision arithmetic on operands in memory, allowing numbers to be arbitrarily long and overflow to be avoided, the register width limits the sizes of numbers that can be operated on (e.g., added or subtracted) using a single instruction per operation. Typical binary register widths for unsigned integers include:
Wikipedia · Text under CC-BY-SA license- Estimated Reading Time: 10 mins
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Signed Overflow (GNU C Language Manual)
Learn how signed integer overflow is undefined and unpredictable in C, and how to control its handling with compiler options. See examples of optimizations and warnings for signed overflow.
Understanding Signed Integer Overflow in C: A Deep Dive into …
Jan 24, 2025 · Understanding signed integer overflow and its implications is critical for writing robust C programs. By aligning your code with defined behaviors and avoiding overflow …
4.4 — Signed integers – Learn C++ - LearnCpp.com
If an arithmetic operation (such as addition or multiplication) attempts to create a value outside the range that can be represented, this is called integer overflow (or arithmetic overflow).
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Understanding Signed Integer Overflow and Undefined Behavior …
Jan 24, 2025 · This post explores signed integer overflow and undefined behavior in C, highlighting an example where GCC produces unexpected outputs. Understanding these …
C++ Tutorial => Signed Integer Overflow
Learn what signed integer overflow is and why it is undefined behavior in C++. See examples of how it can cause reproducible, non-crashing behavior and how compilers may optimize it away.
Integer Overflow (GNU C Language Manual)
Signed numbers use two’s-complement representation, in which the most negative number lacks a positive counterpart (see Integers in Depth). Thus, the unary ‘ - ’ operator on a signed …
C Language Tutorial => Signed integer overflow
Learn what signed integer overflow is and how it produces undefined behavior in C language. See examples of overflow-safe and overflow-prone arithmetic operations and how to avoid them.
Why is unsigned integer overflow defined behavior but signed …
In a sign + value implementation, MAX_INT+1 == -0, while on a two's complement it would be INT_MIN. The historical reason is that most C implementations (compilers) just used whatever …
How to Fix Signed Integer Overflow: Step-by-Step Guide
Discover effective solutions to fix signed integer overflow in C. This step-by-step guide is tailored for firmware developers seeking reliable code corrections. Signed integer overflow occurs …
Dealing with integer overflows – Belay the C++
Jun 8, 2021 · Learn how to detect and prevent integer overflows in C++, both signed and unsigned, using tools, tests and practices. Find out the pros and cons of using 64-bits integers …
C Compiler Considerations for Signed Integer Overflows
Some C compilers aggressively optimize signed operations for in-range values at the expense of overflow conditions. Other compilers preserve the full wrap-on-overflow behavior. For …
R3161R4 - Unified integer overflow arithmetic
Mar 24, 2025 · Unsigned integer division never overflows, and signed integer division only overflows in the degenerate case INT_MAX/-1 which is trivial to check. One may also note that …
Allowing signed integer overflows in C/C++ - Stack Overflow
Jan 11, 2010 · I want signed integers to overflow when they become too big. How do I achieve that without using the next biggest datatype (or when I am already at int128_t)? For example using …
C Compiler Considerations for Signed Integer Overflows
Some C compilers aggressively optimize signed operations for in-range values at the expense of overflow conditions. Other compilers preserve the full wrap-on-overflow behavior. For …
LKML: <jianqi.ren.cn@windrive ...: [PATCH 6.6.y] kunit/overflow: …
23 hours ago · Signed-off-by: Jianqi Ren <jianqi.ren.cn@windriver.com> Signed-off-by: He Zhe <zhe.he@windriver.com> --- Verified the build test --- lib/overflow_kunit.c | 3 +-- 1 file changed, …
How to check for signed integer overflow in C without undefined ...
You can really only check for overflow with unsigned integers and arithmatic: unsigned a,b,c; a = b + c; if (a < b) { /* overflow */ } The behavior of overflow with signed integers is undefined in C, …
LKML: Parvathi Pudi: [PATCH net-next v4 03/11] net: ti: prueth: …
23 hours ago · PRU-ICSS for packet receive and transmit. All declarations and macros are being used from common header file for various protocols. Signed-off-by: Roger Quadros …
c - Signed integer overflow: 999999999 * 10 cannot be …
Dec 6, 2016 · Given a signed 32-bit integer x, return x with its digits reversed. If reversing x causes the value to go outside the signed 32-bit integer range [-231, 231 - 1], then return 0. …
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