C overflow demonstration

gistfile1.txt

λ ~/Desktop/ ./overflow
Before any reassignment:
i = 512 	= 0x200
c = 127 	= 0x7f
When i = c, then c = i:
i = 127 	= 0x7f
c = 127 	= 0x7f
When c = i, then i = c:
i = 0 	= 0x0
c = 0 	= 0x0

overflow.c

#include <stdio.h>

int main() {

  int i = 512;
  char c = 127;

  printf("Before any reassignment: \n");
  printf("i = %d \t= 0x%x\n", i, i);
  printf("c = %d \t= 0x%x\n", c, c);

  i = c;
  c = i;

  printf("When i = c, then c = i:\n");
  printf("i = %d \t= 0x%x\n", i, i);
  printf("c = %d \t= 0x%x\n", c, c);

  i = 512;
  c = 127;

  c = i;
  i = c;

  printf("When c = i, then i = c:\n");
  printf("i = %d \t= 0x%x\n", i, i);
  printf("c = %d \t= 0x%x\n", c, c);  

  return 0;
}