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POThere is an error in my calculator app(java.lang.NumberFormatException)
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copied!<p>I'm getting this error in my code: <code>java.lang.NumberFormatException</code>.</p> <ul> <li><code>m1</code> is for main string that contains the whole expression</li> <li><code>s</code> is for second number if no operator other than division is present </li> <li><code>f</code> is for first number if no operator other than division is present</li> <li><code>f1</code> is for first number if operator other than division is also present</li> <li><code>s1</code> is for second number if operator other than division is also present</li> </ul> <p>Here is the code:</p> <pre><code>b12.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub String s=""; String f=""; String f1=""; String s1=""; int z=m1.length(); int pos,pos1; for(int i=0;i&lt;z;i++) { int m=m1.codePointAt(i); //Checking for division if(m==47) { // Loop to calculate second number for(int j=i+1;j&lt;z;j++) { int d=m1.codePointAt(j); if(d!=43||d!=45||d!=42||d!=47) { s+=m1; } else { pos=j; s1+=m1.substring(pos,z); break; } } // Loop to calculate first number for(int j=i-1;j&gt;=0;j--) { int d=m1.codePointAt(j); if(d!=43||d!=45||d!=42||d!=47) { f+=m1; } else { pos1=j; f1+=m1.substring(0,pos1); break; } } String rev=new StringBuffer(f).reverse().toString(); float ans=Float.parseFloat(rev)/Float.parseFloat(s); String e=Float.toString(ans); if(f1==""&&s1=="") { m1=""+e; } else { m1=""+f1+e+s1; } z=m1.length(); e1.setText(m1); } } } }); } </code></pre>

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