Float32ToInt32Converter

Float32ToInt32Converter.java

public class Float32ToInt32Converter {
    public static int convertFloat32ToInt32(float f) {
        if (f == 0.0f) return 0;

        int bits = Float.floatToRawIntBits(f);
        int sign = (bits >>> 31) & 0x1;
        int exponent = (bits >>> 23) & 0xFF;
        int mantissa = bits & 0x7FFFFF;

        if (exponent == 0xFF) {
            return mantissa == 0 ? (sign == 0 ? Integer.MAX_VALUE : Integer.MIN_VALUE) : 0;
        }

        int adjustedExponent = exponent - 127;
        int result = 0x800000 | mantissa;

        if (adjustedExponent > 7) {
            return sign == 0 ? Integer.MAX_VALUE : Integer.MIN_VALUE;
        } else if (adjustedExponent >= -23) {
            result = adjustedExponent >= 0 ? result << adjustedExponent : result >>> -adjustedExponent;
        } else {
            return sign == 0 ? 0 : -1;
        }

        return sign == 1 ? -result : result;
    }

    public static void main(String[] args) {
        float[] testValues = {0.0f, -0.0f, 1.0f, -1.0f, 1.5f, -1.5f,
                Float.MAX_VALUE, Float.MIN_VALUE,
                Float.POSITIVE_INFINITY, Float.NEGATIVE_INFINITY,
                Float.NaN};

        for (float value : testValues) {
            int result = convertFloat32ToInt32(value);
            System.out.printf("Float: %f, Int: %d%n", value, result);
        }
    }
}

gistfile1.txt

Float: 0.000000, Int: 0
Float: -0.000000, Int: 0
Float: 1.000000, Int: 8388608
Float: -1.000000, Int: -8388608
Float: 1.500000, Int: 12582912
Float: -1.500000, Int: -12582912
Float: 340282346638528860000000000000000000000.000000, Int: 2147483647
Float: 0.000000, Int: 0
Float: Infinity, Int: 2147483647
Float: -Infinity, Int: -2147483648
Float: NaN, Int: 0

Process finished with exit code 0