In android studio, use java code that calculates the area of a circle given the radius as input via an edittext and display the result in a textview on the click of a button. (area = pi * radius * radius).
to convert text into a number use: radius = double. parsedouble(youredittext.;

Consider the usual algorithm to convert an infix expression to a postfix expression. suppose that you have read 10 input characters during a conversion and that the stack now contains these symbols: (5 points) | | | + | | ( | bottom |_*_| now, suppose that you read and process the 11th symbol of the input. draw the stack for the case where the 11th symbol is