C complex number and printf

Question

How to print ( with printf ) complex number? For example, if I have this code:

#include 
#include 
int main(void)
{
    doubl         


        

Answer 1

Using GNU C, this works:

printf("%f %f\n", complexnum);

Or, if you want a suffix of "i" printed after the imaginary part:

printf("%f %fi\n", complexnum);