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author | Adam Carpenter <adam.carpenter@adp.com> | 2019-02-11 16:59:01 -0500 |
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committer | Adam Carpenter <adam.carpenter@adp.com> | 2019-02-11 16:59:01 -0500 |
commit | ef1bf4921ee4127d461eec03a14c9070d193345c (patch) | |
tree | ab9f4ed73fcf97656743c959ce8c9adbe2ce9924 /ftoctof/src | |
download | learning-rust-ef1bf4921ee4127d461eec03a14c9070d193345c.tar.xz learning-rust-ef1bf4921ee4127d461eec03a14c9070d193345c.zip |
Init.
Diffstat (limited to 'ftoctof/src')
-rw-r--r-- | ftoctof/src/main.rs | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/ftoctof/src/main.rs b/ftoctof/src/main.rs new file mode 100644 index 0000000..6425344 --- /dev/null +++ b/ftoctof/src/main.rs @@ -0,0 +1,43 @@ +use std::env; + +fn print_usage() { + eprintln!("error: usage: ftoctof [degrees] [f|c]"); +} + +fn main() { + // grab degrees value + let degrees: f32 = match env::args().nth(1) { + Some(s) => { + let attempt: f32 = s.trim().parse() + .expect("error: could not parse degrees"); + attempt + }, + None => { + print_usage(); + return; + }, + }; + + // grab scale identifier + let scale = match env::args().nth(2) { + Some(s) => s.to_lowercase(), + None => { + print_usage(); + return; + }, + }; + + // compute and print conversion + if scale == "f" { + let result: f32 = (degrees - 32.0) * 5.0 / 9.0; + println!("{} degrees fahrenheight is {} degrees celcius.", degrees, result); + } + else if scale == "c" { + let result: f32 = degrees * 9.0 / 5.0 + 32.0; + println!("{} degrees celcius is {} degrees fahrenheight.", degrees, result); + } + else { + print_usage(); + } + +} |