Modern C for Absolute Beginners: A Friendly Introduction to the C Programming Language

© Slobodan Dmitrović 2021

S. DmitrovićModern C for Absolute Beginnershttps://doi.org/10.1007/978-1-4842-6643-4_41

41. Do Not Overflow a Signed Integer

Slobodan Dmitrović¹  

(1)

Belgrade, Serbia

 

There are lower and upper limits to values a signed integer can hold. The maximum signed integer value is represented by an INT_MAX macro, and the minimum signed integer value is represented by the INT_MIN macro. These macros are declared inside the <limits.h> header.

Trying to store the value that is higher than the allowable maximum or lower than the allowable minimum causes undefined behavior . Example:

#include <stdio.h>

#include <limits.h>

int main(void)

{

      int x = INT_MAX;

      printf("The maximum integer value is: %d\n", x);

      printf("Trying to store ...