// Here we declare some global variables used later in the programme
volatile int32_t dividend_int32 = 20000;
volatile float dividend_float = 20000.0;
volatile int32_t divisor_int32 = 77;
volatile float divisor_float = 77.0;
volatile int32_t reciprocal_shift16 = 851;

// Here we declare some functions used later in the programme
float div77_fp(float dividend, float divisor) {
    return dividend/divisor;
}

int32_t div77_int(int32_t dividend, int32_t divisor) {
    return dividend/divisor;
}
int32_t div77_int_nodiv(int32_t dividend, int32_t reciprocal_shift16) {
    // This is integer division implemented using a multiply and
    // shift rather than a division operation
    return (dividend*reciprocal_shift16) >> 16;
} 
* Write a typedef declaration such that we can refer to the union 
 * declared above using the type alias "float_fields".