| 111 | } |
| 112 | |
| 113 | fn main() { |
| 114 | basic(); |
| 115 | peek(); |
| 116 | iter(); |
| 117 | |
| 118 | fn basic() { |
| 119 | let mut s = Stack::new(); |
| 120 | s.push(1); s.push(2); s.push(3); |
| 121 | |
| 122 | println!("size: {}, {:?}", s.len(), s); |
| 123 | println!("pop {:?}, size {}",s.pop().unwrap(), s.len()); |
| 124 | println!("empty: {}, {:?}", s.is_empty(), s); |
| 125 | |
| 126 | s.clear(); |
| 127 | println!("{:?}", s); |
| 128 | } |
| 129 | |
| 130 | fn peek() { |
| 131 | let mut s = Stack::new(); |
| 132 | s.push(1); s.push(2); s.push(3); |
| 133 | |
| 134 | println!("{:?}", s); |
| 135 | let peek_mut = s.peek_mut(); |
| 136 | if let Some(top) = peek_mut { |
| 137 | *top = 4; |
| 138 | } |
| 139 | |
| 140 | println!("top {:?}", s.peek().unwrap()); |
| 141 | println!("{:?}", s); |
| 142 | } |
| 143 | |
| 144 | fn iter() { |
| 145 | let mut s = Stack::new(); |
| 146 | s.push(1); s.push(2); s.push(3); |
| 147 | |
| 148 | let sum1 = s.iter().sum::<i32>(); |
| 149 | let mut addend = 0; |
| 150 | for item in s.iter_mut() { |
| 151 | *item += 1; |
| 152 | addend += 1; |
| 153 | } |
| 154 | |
| 155 | let sum2 = s.iter().sum::<i32>(); |
| 156 | println!("{sum1} + {addend} = {sum2}"); |
| 157 | assert_eq!(9, s.into_iter().sum::<i32>()); |
| 158 | } |
| 159 | } |