Overflow in char and unsigned char data types : char Calculation « Data Type « C Tutorial

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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 <stdio.h>
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