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java基础试题（Java basic examination questions）.doc

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java基础试题（Java basic examination questions）.doc

java基础试题（Java basic examination questions） First, basic program execution 1. print the following effects ***************************** * Hello, world * ***************************** Two. Data types and variables and basic operators 1. degrees Fahrenheit and Celsius, and you change from Fahrenheit to Celsius, you just subtract 32, multiply 5, and then divide 9, turn Celsius to Fahrenheit, multiply it by 9, divide by 5, and 32. Double f = 100; / / Fahrenheit Double C = 37; / / Celsius Fahrenheit to Celsius / / System.out.println ((f – 32) * 5 / 9); Turn / Celsius Fahrenheit System.out.println (c * 9 / 5 + 32); 2. known a, B are integer variables, write the A, B two variables in the value of the swap program. Int a = 3; Int b = 5; Int TMP = a; / / temporary variable A = b; B = tmp; System.out.println (a= + a); System.out.println (b= + B); 3. swap the values of two variables in AB without third party variables Int a = 3; Int b = 5; A=a+b; / / get the sum of a B=a-b; / / get the old a value assigned to B A=a-b; / / get the old b value assigned to a System.out.println (a= + a); System.out.println (b= + B); 4. input an arbitrary floating-point number, such as 3.123456789, retain its two decimal output, without four to five entries / / create input stream Scanner input = new Scanner (System.in); Get / input floating-point numbers Double D = input.nextDouble (); / / a floating-point number is multiplied by 100 (retained 2) after rounding, divided by 100 reduced to float System.out.println ((int) (d * 100) / 100); 5. input an arbitrary 5 bit integer, keep it to 100 bits, without four to five entries Scanner scanner = new Scanner (System.in); Int i = scanner.nextInt (); System.out.println (I / 100 * 100); 1. enter an integer of 0~1000, calculate the sum of each number, for example, the result of 345 is 3+4+5 = 12 Note: the decomposition of numbers can either be done either in the latter or in the first one Scanner scan = new Scanner (System.in); Int i = scan.nextInt (); Digita