Question

Write a program which asks the user for a four digit INTEGER and outputs the sum of the four digits in the integer i.e.
If the user enters 1234 then the program outputs 10 i.e. 1+2+3+4.
The program should:
Ask the user for required input – a four digit INTEGER.
IMPORTANT NOTE YOUR INPUT IS A 4 digit integer in ONE INTEGER VARIABLE
YOU CANNOT ask the user to enter four separate digits in four different integer variables.

CALL A FUNCTION sum_four to calculate the sum of the four digits as discussed above.
The prototype for