84 lines
1.5 KiB
Rust
84 lines
1.5 KiB
Rust
fn calc_idx(i: usize) -> usize {
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(i + i + 20) % 4
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}
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fn main() {
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let ns = vec![2, 3, 5, 7];
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for i in 3..10 {
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println!("{}", ns[i]);
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}
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for i in 3..10 {
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println!("{}", ns[i % 4]);
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}
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for i in 3..10 {
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println!("{}", ns[i % ns.len()]);
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}
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for i in 3..10 {
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println!("{}", ns[calc_idx(i)]);
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}
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for i in 3..10 {
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println!("{}", ns[calc_idx(i) % 4]);
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}
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let mut ms = vec![1, 2, 3, 4, 5, 6];
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for i in 0..ms.len() {
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ms[i] *= 2;
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}
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assert_eq!(ms, vec![2, 4, 6, 8, 10, 12]);
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let mut ms = vec![1, 2, 3, 4, 5, 6];
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for i in 0..ms.len() {
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let x = &mut ms[i];
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*x *= 2;
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}
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assert_eq!(ms, vec![2, 4, 6, 8, 10, 12]);
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let g = vec![1, 2, 3, 4, 5, 6];
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let glen = g.len();
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for i in 0..glen {
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let x: u32 = g[i + 1..].iter().sum();
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println!("{}", g[i] + x);
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}
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assert_eq!(g, vec![20, 18, 15, 11, 6, 0]);
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let mut g = vec![1, 2, 3, 4, 5, 6];
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let glen = g.len();
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for i in 0..glen {
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g[i] = g[i + 1..].iter().sum();
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}
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assert_eq!(g, vec![20, 18, 15, 11, 6, 0]);
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let x = 5;
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let mut vec = vec![0; 9];
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for i in x..x + 4 {
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vec[i] += 1;
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}
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let x = 5;
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let mut vec = vec![0; 10];
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for i in x..=x + 4 {
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vec[i] += 1;
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}
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let arr = [1, 2, 3];
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for i in 0..3 {
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println!("{}", arr[i]);
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}
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for i in 0..2 {
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println!("{}", arr[i]);
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}
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for i in 1..3 {
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println!("{}", arr[i]);
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}
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}
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