 Input a and b
 a = ?
7.5
 b = ?
2.5
   7.50000000     +   2.50000000     =   10.0000000    
   7.50000000     -   2.50000000     =   5.00000000    
   7.50000000     *   2.50000000     =   18.7500000    
   7.50000000     /   2.50000000     =   3.00000000

Input a and b a = ? 7.5 b = ? 2.5 7.50000000 + 2.50000000 = 10.0000000 7.50000000 - 2.50000000 = 5.00000000 7.50000000 * 2.50000000 = 18.7500000 7.50000000 / 2.50000000 = 3.00000000