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# To use gdb, we should use gcc -g main.c -o main.out
# The type gdb main.out
# in gdb
# l[list] list the source code.
# n next
# p print
# s step
# bt print backtrace of all stack frames, or innermost COUNT frames.
# f Select and print a stack frame.

#include <stdio.h>

int change(int *a, int *b)
{
  int tmp = *a;
  *a = *b;
  *b = tmp;
}

int main()
{
  int a = 1;
  int b = 2;
  change(&a, &b);
  printf("a = %d\nb = %d\n", a, b);
  return 0;
}

#include <stdio.h>

int change(int a, int b)
{
  int tmp = a;
  a = b;
  b = tmp;
}

int main()
{
  int a = 1;
  int b = 2;
  change(a, b);
  printf("a = %d\nb = %d\n", a, b);
  return 0;
}