수다닷컴

#include stdio.h
#include math.h
struct complex{
double real;
double imag;
};
typedef struct complex complex;
void add(complex a,complex b);
void sub(complex a,complex b);
void mul(complex a,complex b);
void div(complex a,complex b);

int main()
{
complex i={6,3};
complex j={4,6};
add(i,j);
sub(i,j);
mul(i,j);
div(i,j);
return 0;
}
void add(complex a,complex b)
{
printf(%.2lf+%.2lfi\n,a.real+b.real,a.imag+b.imag);
}
void sub(complex a,complex b){
printf(%.2lf+%.2lfi\n,a.real-b.real,a.imag-b.imag);
}
void mul(complex a,complex b){
printf(%.2lf+%.2lfi\n,a.real*b.real-a.imag*b.imag,a.real*b.imag+a.imag*b.real);
}
void div(complex a,complex b){
printf(%.2lf+%.2lfi\n,(a.real*b.real-a.imag*b.imag)/(pow(b.real,2)+pow(b.imag,2)),(a.imag*b.real-a.real*b.imag)/(pow(b.real,2)+pow(b.imag,2));
}

real하고 imag에서 에러가 나네요...
어디서 잘 못 된 걸까요?

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