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<pre><code class="r"># Perfect number checker in R: | ||
is_perfect_number <- function(n) { | ||
|
||
#' @description Checks if number passed as a parameter is a perfect number. | ||
#' @param n number to check | ||
#' @usage is_perfect_number(n) | ||
#' @details In number theory, a perfect number is a positive integer that | ||
#' is equal to the sum of its positive divisors, excluding the number itself. | ||
#' For instance, 6 has divisors 1, 2 and 3 (excluding itself) | ||
#' and 1 + 2 + 3 = 6, so 6 is a perfect number. | ||
#' @references https://en.wikipedia.org/wiki/Perfect_number | ||
|
||
if (n < 0) stop("Parameter n must have positive value") | ||
|
||
sum_of_divisors <- 0 | ||
limit <- n - 1 | ||
|
||
for (i in 1:limit) { | ||
if (n %% i == 0) { | ||
sum_of_divisors <- sum_of_divisors + i | ||
} | ||
} | ||
|
||
return(sum_of_divisors == n) | ||
} | ||
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||
result <- is_perfect_number(4) | ||
print(result) # expected false | ||
|
||
result <- is_perfect_number(5) | ||
print(result) # expected false | ||
|
||
result <- is_perfect_number(6) | ||
print(result) # expected true | ||
|
||
result <- is_perfect_number(7) | ||
print(result) # expected false | ||
|
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result <- is_perfect_number(28) | ||
print(result) # expected true | ||
</code></pre> | ||
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</body> | ||
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</html> |
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```r | ||
|
||
is_perfect_number <- function(n) { | ||
|
||
#' @description Checks if number passed as a parameter is a perfect number. | ||
#' @param n number to check | ||
#' @usage is_perfect_number(n) | ||
#' @details In number theory, a perfect number is a positive integer that | ||
#' is equal to the sum of its positive divisors, excluding the number itself. | ||
#' For instance, 6 has divisors 1, 2 and 3 (excluding itself) | ||
#' and 1 + 2 + 3 = 6, so 6 is a perfect number. | ||
#' @references https://en.wikipedia.org/wiki/Perfect_number | ||
|
||
if (n < 0) stop("Parameter n must have positive value") | ||
|
||
sum_of_divisors <- 0 | ||
limit <- n - 1 | ||
|
||
for (i in 1:limit) { | ||
if (n %% i == 0) { | ||
sum_of_divisors <- sum_of_divisors + i | ||
} | ||
} | ||
|
||
return(sum_of_divisors == n) | ||
} | ||
|
||
result <- is_perfect_number(4) | ||
print(result) # expected false | ||
|
||
result <- is_perfect_number(5) | ||
print(result) # expected false | ||
|
||
result <- is_perfect_number(6) | ||
print(result) # expected true | ||
|
||
result <- is_perfect_number(7) | ||
print(result) # expected false | ||
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result <- is_perfect_number(28) | ||
print(result) # expected true | ||
``` |
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is_perfect_number <- function(n) { | ||
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#' @description Checks if number passed as a parameter is a perfect number. | ||
#' @param n number to check | ||
#' @usage is_perfect_number(n) | ||
#' @details In number theory, a perfect number is a positive integer that | ||
#' is equal to the sum of its positive divisors, excluding the number itself. | ||
#' For instance, 6 has divisors 1, 2 and 3 (excluding itself) | ||
#' and 1 + 2 + 3 = 6, so 6 is a perfect number. | ||
#' @references https://en.wikipedia.org/wiki/Perfect_number | ||
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if (n < 0) stop("Parameter n must have positive value") | ||
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sum_of_divisors <- 0 | ||
limit <- n - 1 | ||
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for (i in 1:limit) { | ||
if (n %% i == 0) { | ||
sum_of_divisors <- sum_of_divisors + i | ||
} | ||
} | ||
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return(sum_of_divisors == n) | ||
} | ||
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result <- is_perfect_number(4) | ||
print(result) # expected false | ||
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result <- is_perfect_number(5) | ||
print(result) # expected false | ||
|
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result <- is_perfect_number(6) | ||
print(result) # expected true | ||
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result <- is_perfect_number(7) | ||
print(result) # expected false | ||
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result <- is_perfect_number(28) | ||
print(result) # expected true |