Floating point comparison

#!/bin/bash
# Floating point comparison
# (C) Oliver Stieber oliverthered [email protected]
# Public Domain

f1=0.01
f2=0.2

float_cp () {
    IFS="."
    read -ra float1 <<< "$1"
    read -ra float2 <<< "$2"
    while [[ ${#float2[1]} -lt ${#float1[1]} ]]
    do
        float2[1]+="0"
    done
    while [[ ${#float2[1]} -gt ${#float1[1]} ]]
    do
        float1[1]+="0"
    done
    if [[ ${float1[0]} -gt ${float2[0]} || (${float1[0]} -eq ${float2[0]} && ${float1[1]} -gt ${float2[1]}) ]]; then
        echo 1
    elif [[ ${float1[0]} -eq ${float2[0]} && ${float1[1]} -eq ${float2[1]} ]]; then
        echo 0
    else
        echo -1
    fi
}

if [[ "$(float_cp $f1 $f2)" -eq 0 ]]; then
    echo "yay eq"
elif  [[ "$(float_cp $f1 $f2)" -gt 0 ]]; then
    echo "may gt"
elif  [[ "$(float_cp $f1 $f2)" -lt 0 ]]; then
    echo "nay lt"
fi

tests ()
{
    echo "eq"
    if [[ "$(float_cp 0.1 0.1)" -eq 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 10.11 10.11)" -eq 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp .11 0.11)" -eq 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 0.11 .11)" -eq 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 0.110 .11)" -eq 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 0.11 .110)" -eq 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    echo "gt"
    if [[ "$(float_cp 0.2 0.1)" -gt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 2.1 0.1)" -gt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 20.11 10.11)" -gt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 10.21 10.11)" -gt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp .12 0.11)" -gt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 0.12 .11)" -gt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 0.120 .11)" -gt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 0.12 .110)" -gt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    echo "lt"
    if [[ "$(float_cp 0.1 0.2)" -lt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 0.1 21)" -lt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 10.11 20.11)" -lt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 10.11 10.21)" -lt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp .11 0.12)" -lt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 0.11 .12)" -lt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 0.11 .120)" -lt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi
    if [[ "$(float_cp 0.110 .12)" -lt 0 ]]; then
        echo "pass"
    else
        echo "fail"
    fi

}

echo "$(tests)"