StackOverflow2013

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POJava String Program
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copied!<p>I'm trying to do a String Program using BufferedReader where you take a String from the user and change the case of the letters. this is what I've got so far:</p> <pre><code>import java.io.*; public class StringProg { public void ff()throws IOException { BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); System.out.println("Enter a sentence"); String str=br.readLine(); String s=""; int l=str.length(); char c; for(int a = 1; a < l; a++) { c = str.charAt(a); char d = 0; if(c >= 97 && c <= 122) { d = c - 32; } else if(c >= 65 && c <= 90) { d = c + 32; } System.out.print(d); } } } </code></pre> <p>when I run it, it says "possible loss of precision; required char; found int" could someone help me rectify this please?</p> <p>Update: this is the new code after correction:</p> <pre><code>import java.io.*; public class StringProg { public void ff()throws IOException { BufferedReader br=new BufferedReader(new InputStreamReader(System.in)); System.out.println("Enter a sentence"); String str=br.readLine(); String s=""; int l=str.length(); char c; char d; for(int a=1;a<l;a++) { c=str.charAt(a); if(c>=97 && c<=122) { d= (char)(c-32); } else if(c>=65 &&c<=90); { d=(char)(c+32); } System.out.print(d); } } } </code></pre> <p>but the output isn't working.Could someone point out my mistake please? when I enter "a" or "b", there is no output but when I enter "E" it changes to "e", but when I enter "HidE" it changes to 2 squares(I don't know how to print it on the keyboard ) and "e".</p>

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