Introduction to Java Programming _ first week (bottom)

Java Summary

• Common code: Scanner in = new Scanner (system.in);
• Usage of shortcut keys
  • Note: Crtl +/
  • Fast input: Alt +/Mac:option +/
  • Select line of code: SHIFT + up/down arrows

First, floating point number

Second, priority

Iii. type Conversion

1.1 Floating-point numbers-this does not fully display, the floating-point number conflicts with Int.

Solution:

1. 1. 12 instead of 12.0
   2. Modify inch
      • int inch change to double inch
      • Nextint instead of an int instead of a double nextdouble read in.

ImportJava.util.Scanner; Public classHello { Public Static voidMain (string[] args) {//TODO auto-generated Method Stub//5 feet, 7 inches tall? Conversion//formula (5+7)/12*0.3048        intFoot; intinch; Scanner in=NewScanner (system.in); Foot=In.nextint (); Inch=in.nextint ();//System.out.println (10/3);//The result can only be integers, 10 and 10.0 are different in Java 10.0 is a floating-point numberSystem.out.println ("foot=" + Foot + ", inch=" +inch);//View Output ResultsSystem.out.println ((FOOT+INCH/12) *0.3048); }}

1.2. How floating-point numbers are stored in the computer

2.1 Priority level

1. General operators: Thinking of normal thinking

2. Special operators:

• Monocular operator
• Binding Relationship-Assignment Operation result=a=b = 3+c (still thinking with conventional thinking)

3.1 Type conversions

Final display Results

Other examples

• int i = 32/3.0;
• int i = (int) (32/3.0); Values and types are bracketed, not changing the original value

Introduction to Java Programming _ first week (bottom)