#include<stdio.h>
void sub_sum(float *x1, float *i1, float *x2, float *i2)
{
	float a1 = *x1+*x2;
	float b1 = *i1+*i2;
	float a2 = *x1-*x2;
	float b2 = *i1-*i2;
	*x1 = a1;
	*i1 = b1;
	*x2 = a2;
	*i2 = b2;
}

int main()
{
	float a1,b1,a2,b2;
	printf("Enter first complex number: ");
	scanf("%f + i%f",&a1,&b1);

	printf("Enter first complex number: ");
	scanf("%f + i%f",&a2,&b2);

	sub_sum(&a1,&b1,&a2,&b2);

	printf("Sum:%f + i%f \nDifference:%f + i%f\n",a1,b1,a2,b2);
}