Prog#171: difference of 2 complex numbers

C Programming
#1 
/*
difference of 2 complex numbers
Program#171
*/
#include<stdio.h>
main()
{
typedef struct complex
{
int real;
int image;
}COMPLEX;
COMPLEX C1, C2, C3;
scanf("%d, %d, %d, %d", & C1.real, & C1.image, & C2.real, & C2.image);
C3.real=C2.real-C1.real;
C3.image=C2.image-C1.image;
printf("%d+i%d", C3.real, C3.image);
}