struct_procedure_1.cpp

+#include <iostream>
+
+using namespace std;
+
+struct cpx{
+	double real;
+	double img;
+};
+
+void sum(cpx x, cpx y, cpx &z)
+{
+	z.real = x.real + y.real + z.real;
+	z.img = x.img + y.img + z.img;
+}
+
+void multiply(cpx x, cpx y, cpx &z)
+{
+	z.real = x.real * y.real - (x.img * y.img); 
+	z.img = x.real * y.img + x.img * y.real;
+}
+
+int main()
+{
+	cpx x = { 0, 4 };
+	cpx y = { 2, 3 };
+	cpx z = { 1, -2 };
+
+	sum(x, y, z);
+	
+	multiply(z, y, x);
+
+	cout << "x = (" << x.real << "," << x.img << ")" << endl;
+}
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