Why "Exception while reading user's input as an int"

[soc86]

Why am I getting the following output when I try entering my input (27.5)

"Please enter the wheel radius

27.5

Exception while reading user's input as an int"



Below are my inputs and the corrasponding outputs, where am i going wrong??

Typical input:
27.5 55 23 19 15 0

Corresponding typical output
The effective radius for radius 27.5 and sprockets 55 and 23 is 65.77
The effective radius for radius 27.5 and sprockets 55 and 19 is 79.60
ratio to previous 1.21
The effective radius for radius 27.5 and sprockets 55 and 15 is 100.83
ratio to previous 1.266






public class BicylceGears{

public static void main (String[]args){

double wheelRad;
int fSprocket;
int rSprocket;
double eRad=0;
double ratio;
double eRadLst=0.0;

System.out.println("Please enter the wheel radius");
wheelRad =UserInput.readDouble();

fSprocket =UserInput.readInt();

rSprocket =UserInput.readInt();


if( (wheelRad <= 0.0) || (fSprocket <= 0) || (rSprocket <= 0)){


System.out.println("message Error, invalid value and do not let your program continue.");

}else{


eRad = wheelRad*fSprocket/rSprocket;

ratio=eRadLst/eRad;

System.out.println("The effective radius for raduis "+wheelRad+" and sprockets ");
System.out.println("ratio to previous "+ratio);

eRadLst= eRad+0.0;

}
while (eRad >0.0){


eRad = wheelRad*fSprocket/rSprocket;

ratio=eRadLst/eRad;

System.out.println("The effective radius for raduis "+wheelRad+" and sprockets ");
System.out.println("ratio to previous "+ratio);

eRadLst= eRad+0.0;


}
}//end main

}//end class

[Steve11235]

Because 27.5 is a float, not an int.