Visual C#.net examples

Transcription

1 Visual C#.net examples January This document contains set of visual c#. Net examples. That can help under graduate students to learn by examples. Have Fun! prepared by: Ismael Abdul Sattar

2 int x; // this declares a variable int y; // this declares another variable x = 100; // this assigns 100 to x MessageBox.Show("x contains " + x); y = x / 2; MessageBox.Show("y contains x / 2:" + y); int ivar; // this declares an int variable double dvar; // this declares a floating-point variable ivar = 100; // assign ivar the value 100 dvar = 100.0; // assign dvar the value MessageBox.Show("Original value of ivar: " + ivar); MessageBox.Show("Original value of dvar: " + dvar); // Now, divide both by 3. ivar = ivar / 3; dvar = dvar / 3.0; MessageBox.Show("ivar after division: " + ivar); MessageBox.Show ("dvar after division: " + dvar); 1

3 const float PI = f; float Radius = float.parse(textbox1.text), Area; Area = PI * Radius * Radius; // textbox2.text = Convert.ToString(Area); MessageBox.Show(Area.ToString(), "The area of the circle"); long inches; long miles; miles = ; // 93,000,000 miles to the sun // 5,280 feet in a mile, 12 inches in a foot. inches = miles * 5280 * 12; MessageBox.Show("Distance to the sun: " + inches + " inches."); 2

4 double x, y, z, w; x = Convert.ToDouble (textbox1.text); y = Convert.ToDouble (textbox2.text); z = Convert.ToDouble (textbox3.text); w = Math.Pow(2.0d, x) * (32 * y / z); MessageBox.Show("w="+ w); Double r; Double area; area = 10.0; r = Math.Sqrt(area / ); MessageBox.Show("Radius is " + r); 3

5 decimal price; decimal discount; decimal discounted_price; // Compute discounted price. price = 19.95m; discount = 0.15m; // discount rate is 15% discounted_price = price - (price * discount); MessageBox.Show("Discounted price: $" + discounted_price); int iresult, irem; double dresult, drem; iresult = 10 / 3; irem = 10 % 3; dresult = 10.0 / 3.0; drem = 10.0 % 3.0; MessageBox.Show("Result and remainder of 10 / 3= " + iresult + " " + irem +'\n'+"result and remainder of 10.0 / 3.0= " + dresult + " " + drem); 4

6 int a, b, c; a = 2; b = 3; if (a < b) MessageBox.Show("a is less than b"); // This won't display anything. if (a == b) MessageBox.Show("you won't see this"); c = a - b; // c contains -1 MessageBox.Show("c contains -1"); if (c >= 0) MessageBox.Show("c is non-negative"); if (c < 0) MessageBox.Show("c is negative"); Console.WriteLine(); c = b - a; // c now contains 1 MessageBox.Show("c contains 1"); if (c >= 0) MessageBox.Show("c is non-negative"); if (c < 0) MessageBox.Show("c is negative"); int i, j, d; i = 5; j = 10; // The target of this if is a block. if (i!= 0) MessageBox.Show("i does not equal zero"); d = j / i; 5

7 MessageBox.Show("j / i is " + d); double x, y, z, m; x = Convert.ToDouble(textBox1.Text); y = Convert.ToDouble(textBox2.Text); z = Convert.ToDouble(textBox3.Text); m = Math.Pow(x, y)*z; MessageBox.Show("m=" + m); int x, y; x = 1; y = 0; y = y + x++; // postfix ++ MessageBox.Show("postfix value y= "+ y); x = 1; y = 0; y = y + ++x; // prefix ++ MessageBox.Show("prefix value y= " + y); 6

8 int i, j; bool b1, b2; i = 10; j = 11; if (i < j) MessageBox.Show("i < j"); if (i <= j) MessageBox.Show("i <= j"); if (i!= j) MessageBox.Show("i!= j"); if (i == j) MessageBox.Show("this won't execute"); if (i >= j) MessageBox.Show("this won't execute"); if (i > j) MessageBox.Show("this won't execute"); b1 = true; b2 = false; if (b1 & b2) MessageBox.Show("this won't execute"); if (!(b1 & b2)) MessageBox.Show("!(b1 & b2) is true"); if (b1 b2) MessageBox.Show("b1 b2 is true"); if (b1 ^ b2) MessageBox.Show("b1 ^ b2 is true"); double x, y; 7

9 x = Convert.ToDouble(textBox1.Text); y = Math.Ceiling(x); MessageBox.Show("ceiling y="+y); y = Math.Floor(x); MessageBox.Show("Floor y=" + y); y = Math.Abs(x); MessageBox.Show("absolute y=" + y); y = Math.Round(x); MessageBox.Show("round y=" + y); y = Math.Sqrt(x); MessageBox.Show("square root y=" + y); y = Math.Truncate(x); MessageBox.Show("truncate y=" + y); y = Math.Max(8, x); MessageBox.Show("max between x and 8 is " + y); 8

10 // test n is an even or odd number /* if (expression) statment1; next staments...*/ int n; n = Convert.ToInt32(textBox1.Text); /* if (n % 2 == 0) MessageBox.Show("n is Even Number"); */ //using else if if (n % 2==0) MessageBox.Show("n is Even Number"); else MessageBox.Show("n is Odd Number"); private void button2_click(object sender, EventArgs e) // test passing case of student or not int degree; degree = Convert.ToInt32(textBox2.Text); if (degree >= 50) MessageBox.Show("student pass"); else MessageBox.Show("studen Fail"); double x; x = Convert.ToDouble(textBox1.Text); if (x < 0) MessageBox.Show("X is negative"); else if (x == 0) 9

11 MessageBox.Show("x is Zero"); else MessageBox.Show("X is positive "); int x, rem,di; x = Convert.ToInt32(textBox1.Text); rem = x % 10; di = x / 10; x = (rem * 10) + di; textbox2.text = "x=" + x; 11