C Programming Code Examples C > Mathematics Code Examples C Program to Add two Complex Numbers C Program to Add two Complex Numbers This C Program adds two complex numbers. A complex number is a number that can be put in the form a + bi, where a and b are real numbers and i is called the imaginary unit, where i2 = -1. In this expression, a is called the real part and b the imaginary part of the complex number. #include <stdio.h> struct complex { int realpart, imaginary; }; main() { struct complex a, b, c; printf("Enter value of a and b complex number a + ib.\n"); printf("value of complex number a is = "); scanf("%d", &a.realpart); printf("value of complex number b is = "); scanf("%d", &a.imaginary); printf("Enter value of c and d complex number c + id.\n"); printf("value of complex number c is = "); scanf("%d", &b.realpart); printf("value of complex number d is = "); scanf("%d", &b.imaginary); c.realpart = a.realpart + b.realpart; c.imaginary = a.imaginary + b.imaginary; if (c.imaginary >= 0) printf("complex numbers sum is = %d + %di\n", c.realpart, c.imaginary); else printf("complex numbers sum = %d %di\n", c.realpart, c.imaginary); return 0; }