How to convert from string to char in C++?

How to convert a string to a double?

• I need to convert the value of String-avg to the double-numberGrade. Thanks a lot for your help. import javax.swing.JOptionPane; public class April3 { public static void main(String [] args) { String avg; double numberGrade; char letterGrade; while ( ! avg.equals("-1") ) { avg = JOptionPane.showInputDialog("Please enter student average");; if ( (numberGrade >= 0.0) && (numberGrade <= 100.0) ) { letterGrade = getLetter(numberGrade); JOptionPane.showMessageDialog(null… letterGrade); } } } private static char getLetter(double n) { if (n >= 80) { return ('A'); } if (n >= 60) { return ('B'); } if (n >= 40) { return ('C'); } if (n >= 20) { return ('D'); } if (n >= 10) { return ('F'); } return ('Z'); } }

• Answer:

  You could just have getLetter return a String instead of a char, and put "A", "B" and so on instead of how they are now. Another choice is using Character.toString(), you need to import java.lang.Character for this. chars are just integer codes if I remember correctly.