1) Armstrong number: A number is thought of as an Armstrong number if the sum of its own digits raised to the power number of digits gives the number itself.

For example, 0, 1, 153, 370, 371, 407 are three-digit Armstrong numbers and, 1634, 8208, 9474 are four-digit Armstrong numbers and there are many more.

EXAMPLE:Let’s consider 370 since it is a three-digit number so it could be expressed as: (3*3*3)+(7*7*7)+(0*0*)= 27 +343+0 =370

CODE For Armstrong number:

{
num = as.integer(readline(prompt = "Enter a number :"))

rv = 0
temp = num

while (num > 0) {
r = num %% 10
rv = rv + r * r * r
num= num %/% 10
}

if (rv == temp)
{
print(paste("Number is Armstrong :", rv))
}
else{
print(paste("Number is not Armstrong :", rv))
}
}

2)Output of Following code will be

“a”

“b”

“c”

“d”