What is the difference between the following 2 codes?

1
#include stdio.h //Program 1
int main()
{
int d, a = 1, b = 2;
d = a++ + ++b;
printf("%d %d %d", d, a, b);
}
2
  #include stdio.h //Program 2
int main()
{
int d, a = 1, b = 2;
d = a++ +++b;
printf("%d %d %d", d, a, b);
}

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