Книга программиста/Обработка матриц VB

К оглавлению

Все программы, код которых выложен здесь, являются работоспособными. На момент написания программ использовалась среда SharpDevelop 5.1.

Простые задачиПравить

Максимальные элементы столбцов матрицыПравить

Module Program
	Sub Main()
		Const N As Integer = 3
		Const M As Integer = 3
		
		Dim a(N - 1, M - 1) As Integer
		Dim max(M - 1) As Integer
		
		For i As Integer = 0 To N - 1
			For j As Integer = 0 To M - 1
				a(i, j) = Rnd()*100
			Next
		Next
		
		Console.WriteLine("Матрица:")
		For i As Integer = 0 To N - 1
			For j As Integer = 0 To M - 1
				Console.Write(String.Format("{0, 6}", a(i, j)))
			Next
			Console.WriteLine()
		Next
		
		For j As Integer = 0 To M - 1
			max(j) = integer.MinValue
			For i As Integer = 0 To N - 1
				If (a(i, j) > max(j)) Then
					max(j) = a(i, j)
				End If
			Next
		Next
		
		Console.WriteLine("Максимумы:")
		For j As Integer = 0 To M - 1
			Console.Write(String.Format("{0, 3}", max(j)))
		Next
		
		Console.ReadKey()
	End Sub
End Module

Наибольший по модулю элемент матрицыПравить

Module Program
	Sub Print(ByRef a(,) As Integer)
		Console.WriteLine("Матрица:")
		For i As Integer = 0 To a.GetLength(0) - 1
			For j As Integer = 0 To a.GetLength(1) - 1
				Console.Write(String.Format("{0, 6}", a(i, j)))
			Next
			Console.WriteLine()
		Next
	End Sub
	
	Sub Main()
		Const N As Integer = 3
		Const M As Integer = 3
		
		Dim a(N - 1, M - 1) As Integer
		
		For i As Integer = 0 To N - 1
			For j As Integer = 0 To M - 1
				a(i, j) = -10 + Convert.ToInt32(Rnd()*20)
			Next
		Next
		
		Print(a)
		
		Dim max As Integer = 0
		Dim maxI As Integer = 0
		Dim maxJ As Integer = 0
		
		For i As Integer = 0 To N - 1
			For j As Integer = 0 To M - 1
				If (Math.Abs(a(i, j)) > max) Then
					max = Math.Abs(a(i, j))
					maxI = i
					maxJ = j
				End If
			Next
		Next
		
		Console.WriteLine(String.Format("Наибольший по модулю элемент матрицы с индексами [{0}, {1}] равен {2}.", maxI, maxJ, max))
		Console.ReadKey()
	End Sub
End Module

Числа, кратные 2Править

Module Program
	Sub Print(ByRef a(,) As Integer)
		Console.WriteLine("Матрица:")
		For i As Integer = 0 To a.GetLength(0) - 1
			For j As Integer = 0 To a.GetLength(1) - 1
				Console.Write(String.Format("{0, 6}", a(i, j)))
			Next
			Console.WriteLine()
		Next
	End Sub
	
	Sub Main()
		Const N As Integer = 3
		Const M As Integer = 3
		
		Dim a(N - 1, M - 1) As Integer
		
		For i As Integer = 0 To N - 1
			For j As Integer = 0 To M - 1
				a(i, j) = Convert.ToInt32(Rnd()*100)
			Next
		Next
		
		Print(a)
		
		Dim c As Integer = 0
		
		For i As Integer = 0 To N - 1
			For j As Integer = 0 To M - 1
				If ((Math.Abs(a(i, j)) >= 10) And (Math.Abs(a(i, j)) < 100) And ((s \ 2 + s Mod 2) Mod 2 = 0)) Then
					c += 1
				End If
			Next
		Next
		
		Console.WriteLine(String.Format("Количество двузначных чисел с четной суммой цифр равно {0}.", c))
		Console.ReadKey()
	End Sub
End Module

Средняя сложностьПравить

Отрицательные элементы под диагональюПравить

Module Program
	Sub Print(ByRef a(,) As Integer)
		Console.WriteLine("Матрица:")
		For i As Integer = 0 To a.GetLength(0) - 1
			For j As Integer = 0 To a.GetLength(1) - 1
				Console.Write(String.Format("{0, 6}", a(i, j)))
			Next
			Console.WriteLine()
		Next
	End Sub
	
	Sub Main()
		Const N As Integer = 3
		Const M As Integer = 3
		
		Dim a(N - 1, M - 1) As Integer
		
		For i As Integer = 0 To N - 1
			For j As Integer = 0 To M - 1
				a(i, j) = -10 + Convert.ToInt32(Rnd()*20)
			Next
		Next
		
		Print(a)
		
		Dim c As Integer = 0
		
		For i As Integer = 0 To N - 1
			For j As Integer = 0 To M - 1
				If ((i > j) And (a(i, j) < 0)) Then
					c += 1
				End If
			Next
		Next
		
		Console.WriteLine(String.Format("Количество отрицательных элементов под главной диагональю матрицы равно {0}.", C))
		Console.ReadKey()
	End Sub
End Module

Сложные задачиПравить

Заполнение матрицы по правилуПравить

Правило заполнения:

1 2 3 4 5
2 1 2 3 4
3 2 1 2 3
4 3 2 1 2
5 4 3 2 1
Module Program
	Sub Print(ByRef a(,) As Integer)
		Console.WriteLine("Матрица:")
		For i As Integer = 0 To a.GetLength(0) - 1
			For j As Integer = 0 To a.GetLength(1) - 1
				Console.Write(String.Format("{0, 6}", a(i, j)))
			Next
			Console.WriteLine()
		Next
	End Sub
	
	Sub Main()
		Const N As Integer = 9
		
		Dim a(N - 1, N - 1) As Integer
		
		For d As Integer = 0 To N - 1
			For j As Integer = d To N - 1
				a(d, j) = j - d + 1
			Next
			For i2 As Integer = d + 1 To N - 1
				a(i2, d) = i2 - d + 1
			Next
		Next
		
		Print(a)
		
		Console.ReadKey()
	End Sub
End Module