Java Learning Note 11

 PackageWelcome;ImportJava.util.Scanner;/** Algebraic problems: Solving 2x2 linear equations*/ Public classcomputelinearequation { Public Static voidMain (string[] args) {Scanner in=NewScanner (system.in); System.out.print ("Enter A, B, C, D, E, F:"); DoubleA =in.nextdouble (); Doubleb =in.nextdouble (); Doublec =in.nextdouble (); DoubleD =in.nextdouble (); DoubleE =in.nextdouble (); Doublef =in.nextdouble (); Doublex = 0; Doubley = 0; if(A * d-b * c! = 0) {x= (E * d-b * f)/(A * d-b *c); Y= (A * F-E * c)/(A * d-b *c); } Else{System.out.println ("The equation has no solution"); System.exit (0); } System.out.println ("X is" + x + "and Y are" +y); }}

 PackageWelcome;ImportJava.util.Scanner;/** Game: Learn to add*/ Public classtestaddition { Public Static voidMain (string[] args) {intA = (int) (Math.random () * 100); intB = (int) (Math.random () * 100); Scanner in=NewScanner (system.in); System.out.print ("What's" + A + "add" + B + "?"); intGuess =In.nextint (); if(A + b = =guess) {System.out.println ("True"); }Else{System.out.println ("False"); }    }}

 PackageWelcome;ImportJava.util.Scanner;/** Calculate the perimeter of a triangle*/ Public classComputegirth { Public Static voidMain (string[] args) {Scanner in=NewScanner (system.in); System.out.print ("Enter three sides of a triangle:"); DoubleA =in.nextdouble (); Doubleb =in.nextdouble (); Doublec =in.nextdouble (); DoubleG = 0; if(A + B > C && a + C > B && B + C >a) {G= A + B +C; }Else{System.out.println ("The input is illegal"); System.exit (0); } System.out.println ("The triangle has a circumference of" +G); }}

Java Learning Note 11