SUM OF 2 COMPLEX NUMBER 

  #include <stdio.h>
  #include <conio.h>
  #include <stdlib.h>
  struct complex
  {
      int real;
      int img;
  };
  int main()
  {
      struct complex a, b, c;
      printf(" Enter a and b where a + ib is the first complex number. ");
      printf("\n a = ");
      scanf(" %d ", &a.real);
      printf(" b = ");
      scanf(" %d ", &a.img);
      printf(" Enter c and d where c + id is the second complex number. ");
      printf("\n c = ");
      scanf(" %d ", &b.real);
      printf(" d = ");
      scanf(" %d ", &b.img);
      c.real = a.real + b.real;
      c.img = a.img + b.img;
      if ( c.img >= 0 )
          printf(" Sum of two complex numbers = %d + %di ", c.real, c.img);
      else
          printf(" Sum of two complex numbers = %d %di ", c.real, c.img);
      getch();
      return 0;
  }