Without Formula: num = as.integer(readline(prompt = "Enter a number: ")) if(num < 0) { print("Enter a positive number") }... 02 Jan Find sum of natural numbers without/with formula using R Programming Languge Admin | R Examples, R Program to Find the Sum of Natural Numbers | R Programming | 0 Without Formula: num = as.integer(readline(prompt = "Enter a number: ")) if(num < 0) { print("Enter a positive number") }...