size_t bit_mayor(unsigned n)
{
    size_t bits = 0;
    while (n) ++bits, n >>= 1;
 
    return bits;
}
 
bool mult_segura(unsigned a, unsigned b)
{
    size_t a_bits = bit_mayor(a), b_bits= bit_mayor(b);
    return ( a_bits + b_bits <= 32 );
}
 
int main(void)
{
    unsigned a = 2, b = 4294967295;
    unsigned result = 0;
 
    if(mult_segura(a, b))
    {
        result = a * b;
        printf("Multiplicacion: %u\n", result);
    }
    else
        puts("Posible desbordamiento de enteros");
 
    return 0;
}