Strange behaviour when intentionally assigning `i` value greater than INT_MAX

Question

When I assign i value greater than INT_MAX in this code -

#include <stdio.h>
#include <limits.h>

int main()
{

   int i;
   i=INT_MAX+3;

   printf("%d \n",INT_MAX);  //INT_MAX = 2147483647

   if(i>INT_MAX) 
     {     
         printf("OVERFLOW");
     }
  else 
    {
         printf("%d",i);    
    }   
     return 0;
}

So in this as i=INT_MAX+3; then condition is true and overflow should be printed but it prints some negative value. Is it undefined behaviour ?

score 5 · Accepted Answer · answered Jul 25 '15 at 13:43

5

Yes, signed integer overflow has undefined behavior in C.
i > INT_MAX is never true for any int i. How can you have an int greater than the maximum possible int?

answered Jul 25 '15 at 13:43

melpomene

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Strange behaviour when intentionally assigning `i` value greater than INT_MAX

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