Data Type C Tutorial

Overflow means you are carrying out an operation
such that the value either exceeds the maximum value or
is less than the minimum value of the data type.
(Definition from C & Data Structures
by P.S. Deshpande and O.G. Kakde
Charles River Media 2004)

#include 
main()
{
    char i,j ;
    i = 1;
    while (i > 0){
        j = i;
        i++;
    }
    printf ("the maximum value of char is %d\n",j);
    printf ("the value of char after overflow is %d\n",i);
}
the maximum value of char is 127
the value of char after overflow is -128