Check Armstrong number
# take input from the user
num = as.integer(readline(prompt="Enter a number: "))

# initialize sum
sum = 0

# find the sum of the cube of each digit
temp = num
while(temp > 0) {
    digit = temp %% 10
    sum = sum + (digit ^ 3)
    temp = floor(temp / 10)
}

# display the result
if(num == sum) {
    print(paste(num, "is an Armstrong number"))
} else {
    print(paste(num, "is not an Armstrong number"))
}
Output 1

Enter a number: 23
[1] "23 is not an Armstrong number"