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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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49
Task/Loops-Wrong-ranges/C-sharp/loops-wrong-ranges-1.cs Normal file
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using System;
using System.Collections.Generic;
static class Program
{
static void Main()
{
Example(-2, 2, 1, "Normal");
Example(-2, 2, 0, "Zero increment");
Example(-2, 2, -1, "Increments away from stop value");
Example(-2, 2, 10, "First increment is beyond stop value");
Example(2, -2, 1, "Start more than stop: positive increment");
Example(2, 2, 1, "Start equal stop: positive increment");
Example(2, 2, -1, "Start equal stop: negative increment");
Example(2, 2, 0, "Start equal stop: zero increment");
Example(0, 0, 0, "Start equal stop equal zero: zero increment");
}
static IEnumerable<int> Range(int start, int stop, int increment)
{
// To replicate the (arguably more correct) behavior of VB.NET:
//for (int i = start; increment >= 0 ? i <= stop : stop <= i; i += increment)
// Decompiling the IL emitted by the VB compiler (uses shifting right by 31 as the signum function and bitwise xor in place of the conditional expression):
//for (int i = start; ((increment >> 31) ^ i) <= ((increment >> 31) ^ stop); i += increment)
// "Naïve" translation.
for (int i = start; i <= stop; i += increment)
yield return i;
}
static void Example(int start, int stop, int increment, string comment)
{
// Add a space, pad to length 50 with hyphens, and add another space.
Console.Write((comment + " ").PadRight(50, '-') + " ");
const int MAX_ITER = 9;
int iteration = 0;
foreach (int i in Range(start, stop, increment))
{
Console.Write("{0,2} ", i);
if (++iteration > MAX_ITER) break;
}
Console.WriteLine();
}
}

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Task/Loops-Wrong-ranges/C-sharp/loops-wrong-ranges-2.cs Normal file
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using System;
static class Program {
struct S {
public int Start, Stop, Incr;
public string Comment;
}
static readonly S[] examples = {
new S{Start=-2, Stop=2, Incr=1, Comment="Normal"},
new S{Start=-2, Stop=2, Incr=0, Comment="Zero increment"},
new S{Start=-2, Stop=2, Incr=-1, Comment="Increments away from stop value"},
new S{Start=-2, Stop=2, Incr=10, Comment="First increment is beyond stop value"},
new S{Start=2, Stop=-2, Incr=1, Comment="Start more than stop: positive increment"},
new S{Start=2, Stop=2, Incr=1, Comment="Start equal stop: positive increment"},
new S{Start=2, Stop=2, Incr=-1, Comment="Start equal stop: negative increment"},
new S{Start=2, Stop=2, Incr=0, Comment="Start equal stop: zero increment"},
new S{Start=0, Stop=0, Incr=0, Comment="Start equal stop equal zero: zero increment"}
};
static int Main() {
const int limit = 10;
bool empty;
for (int i = 0; i < 9; ++i) {
S s = examples[i];
Console.Write("{0}\n", s.Comment);
Console.Write("Range({0:d}, {1:d}, {2:d}) -> [", s.Start, s.Stop, s.Incr);
empty = true;
for (int j = s.Start, c = 0; j <= s.Stop && c < limit; j += s.Incr, ++c) {
Console.Write("{0:d} ", j);
empty = false;
}
if (!empty) Console.Write("\b");
Console.Write("]\n\n");
}
return 0;
}
}