17_17

using System;

namespace Lab17
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            double[,] a = {{2, 4, -6, 7.4},{4.5, -3, 5, 0},
                {9.7, 4.2, -3.8, 2.75},{3.3, -0.6, 0, 3.5}};
            double[,] b = {{-1.2, 3, 0},{2.5, 6.3, 1},{1.1, 2, 4.2}};
            double[,] c = new double[5, 5];
            double[,] d = new double[6, 6];
            for(int i = 0; i < 5; ++i)
                for(int j = 0; j < 5; ++j)
                    c[i, j] = (1 + j) * i * i + j;
            for(int i = 0; i < 6; ++i)
                for(int j = 0; j < 6; ++j)
                    d[i, j] = Math.Sin(j * i) + 2.2;
            Console.WriteLine("Matrix A:");
            output(a);
            Console.WriteLine("Matrix B:");
            output(b);
            Console.WriteLine("Matrix C:");
            output(c);
            Console.WriteLine("Matrix D:");
            output(d);
            change(a);
            change(b);
            change(c);
            change(d);
            Console.WriteLine("Matrices after change:");
            Console.WriteLine("Matrix A:");
            output(a);
            Console.WriteLine("Matrix B:");
            output(b);
            Console.WriteLine("Matrix C:");
            output(c);
            Console.WriteLine("Matrix D:");
            output(d);
        }
        static double min(double a, double b){
            if (a < b)
                return a;
            else
                return b;
        }
        static void change(double[,] a){
            int n = a.GetLength(0);
            int m = a.GetLength(1);
            double mn = a[0, 0];
            for (int i = 0; i < n; ++i)
                for (int j = 0; j < m; ++j)
                    mn = min (a[i, j], mn);
            a [0, 0] = mn;
        }
        static void output(double[,] a){
            int n = a.GetLength(0);
            int m = a.GetLength(1);
            for (int i = 0; i < n; ++i, Console.WriteLine())
                for (int j = 0; j < m; ++j)
                    Console.Write ("{0,6:F} ", a[i, j]);
        }
    }
}