Java Beginner--Infinite loop

Source: Internet
Author: User

With a For loop and a while loop, you can read any number from the keyboard, input 0 automatically jumps out of the infinite loop, and determines that there are several negative numbers.

Infinite loops for 1.for loops:

1 ImportJava.util.Scanner;//referencing the scanner class for reading keyboard input2 classTestxunhuan3 {4      Public Static voidMain (string[] args)5     {6         inta=0;//record number of positive numbers7         intb=0;//record number of negative numbers8Scanner s=NewScanner (system.in);9          for(;;) {TenSystem.out.println ("Please enter an integer"); One             intsum=s.nextint (); A             if(sum>0) -a++; -             Else if(sum<0) theb++; -             Else -                  Break; -         } +System.out.println ("+a+" is a positive number; "+b+" negative "); -     } +}

Operation Result:

Infinite loops for 2.while loops

1 ImportJava.util.Scanner;//referencing the scanner class for reading keyboard input2 classTestxunhuan3 {4      Public Static voidMain (string[] args)5     {6         inta=0;//record number of positive numbers7         intb=0;//record number of negative numbers8Scanner s=NewScanner (system.in);9          while(true){TenSystem.out.println ("Please enter an integer"); One             intsum=s.nextint (); A             if(sum>0) -a++; -             Else if(sum<0) theb++; -             Else -                  Break; -         } +  -System.out.println ("+a+" is a positive number; "+b+" negative "); +     } A}

Operation Result:

Java Beginner--Infinite loop

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