From 7e8ee5ed9cad6484e9f13f81731b102ced58402e Mon Sep 17 00:00:00 2001 From: Adam Carpenter Date: Tue, 9 Jul 2019 15:14:04 -0400 Subject: Init. --- rust-book/mathsssss/src/main.rs | 61 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100755 rust-book/mathsssss/src/main.rs (limited to 'rust-book/mathsssss/src') diff --git a/rust-book/mathsssss/src/main.rs b/rust-book/mathsssss/src/main.rs new file mode 100755 index 0000000..991590b --- /dev/null +++ b/rust-book/mathsssss/src/main.rs @@ -0,0 +1,61 @@ +use std::env; +use std::collections::HashMap; + +fn calc_mean(numbers: &Vec) -> f32 { + let sum: i32 = numbers.iter().sum(); + sum as f32 / numbers.len() as f32 +} + +fn calc_median(numbers: &Vec) -> i32 { + numbers[numbers.len() / 2] +} + +fn calc_mode(numbers: &Vec) -> i32 { + let mut counts: HashMap = HashMap::new(); + + for each in numbers { + let count = counts.entry(*each).or_insert(0); + *count += 1; + } + + let mut most: i32 = 0; + let mut result: i32 = 0; + + for (key, val) in counts.iter() { + + if val > &most { + most = *val; + result = *key; + } + } + + if most <= 1 { + 0 + } + else { + result + } + +} + +fn main() { + // grab numbers + let mut numbers: Vec = Vec::new(); + + for arg in env::args().skip(1) { + let number: i32 = arg.trim().parse() + .expect("error: could not parse arg"); + numbers.push(number); + } + + // sort list (mostly for median) + numbers.sort_by(|a, b| a.partial_cmp(b).unwrap()); + + // calculate and print results + let mean: f32 = calc_mean(&numbers); + println!("mean: {}", mean); + let median: i32 = calc_median(&numbers); + println!("median: {}", median); + let mode: i32 = calc_mode(&numbers); + println!("mode: {}", mode); +} -- cgit v1.2.3