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Roy's questions

Martin Hope
Roy
Asked: 2020-10-24 08:20:32 +0800 CST
  • 19

As the title says, I want to limit the number of decimals that result from an operation with variables of type double, this result is displayed in a JTextArea of ​​a JFrame.

The code that does the operation and prints the result in the JTextArea is as follows: ( la, lband lcrepresent the sides of a triangle, acalculates the area and Ais the JTextArea where the result is printed).

if (lb+lc>la && la+lc>lb && la+lb>lc){
     a=Math.sqrt((la+lb+lc)*(-la+lb+lc)*(la-lb+lc)*(la+lb-lc)/16);
     p=la+lb+lc;
     A.setText("El triangulo es "+t+".\nEl area es ("+a+").\nEl perimetro es ("+p+").");
java