44 lines
1.1 KiB
Plaintext
44 lines
1.1 KiB
Plaintext
/* ===== 模块5：复合类型 =====
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* test09_slices — 切片
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* 难度：2/5
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* 验证点：arr[begin..end] 创建切片、arr[begin..] 到末尾、
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* 切片索引访问、slice.len、slice.ptr
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*/
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fn main() i32 {
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/* 从数组创建切片 */
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var arr: [5]i32 = [5]i32{10, 20, 30, 40, 50};
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var slice: []i32 = arr[1..4];
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/* 切片长度 */
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if slice.len != 3 { ret 1; }
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/* 切片元素访问 */
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if slice[0] != 20 { ret 2; }
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if slice[1] != 30 { ret 3; }
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if slice[2] != 40 { ret 4; }
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/* 省略结束值：arr[begin..] */
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var full: []i32 = arr[0..];
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if full.len != 5 { ret 5; }
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if full[0] != 10 { ret 6; }
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if full[4] != 50 { ret 7; }
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/* 从开头到中间 */
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var head: []i32 = arr[0..3];
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if head.len != 3 { ret 8; }
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if head[0] != 10 { ret 9; }
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/* 切片遍历（配合 for）*/
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var nums: [3]i32 = [3]i32{100, 200, 300};
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var sl: []i32 = nums[0..];
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var total: i32 = 0;
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var i: i32 = 0;
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while i < sl.len {
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total = total + sl[i];
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i = i + 1;
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}
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if total != 600 { ret 10; }
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ret 0;
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}
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