Given the number 12345 :
5 is 12345 % 10
4 is 12345 / 10 % 10
3 is 12345 / 100 % 10
2 is 12345 / 1000 % 10
1 is 12345 / 10000 % 10
I won’t provide a complete code as this surely looks like homework, but I’m sure you get the pattern.