I'm getting stucked on these 2 practice problem. Please help!

6. A cashier has currency notes of denominations 1, 5, 10, 20 and 100. If the amount to be withdrawn is input through the keyboard, find the total number of currency notes of each denomination the cashier will have to give to the customer. 7. If a five-digit integer is input through the keyboard, write a program to print a new number by adding one to each of its digits. For example if the number that is input is 12391 then the output should be displayed as 23402. You are not allowed to use any libraries, change any integer to a string or use the "if" statement