Alternative to float

[shirleyquirk]

I can construct a rounding error with 32 bit floats: 
    
    
    import strformat,strutils
    proc atof(s:cstring):float32{.header:"stdlib.h",import.}
    let num= "1.19999998"
    echo &"{atof(num):.7f} != {parseFloat(num):.7f}"
    
    
    Run

produces 
    
    
    1.1999999 != 1.2000000
    
    
    Run