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Introduction

Write a C program that uses functions to perform the following operations:
i) Reading a complex number
ii) Writing a complex number
iii) Addition of two complex numbers
iv) Multiplication of two complex numbers
(Note: represent complex number using a structure.)

    #include<stdio.h>
    #include<math.h>
    void arithmetic(int opern);
    struct comp
    {
        double realpart;
        double imgpart;
    };
    void main()
    {
        int opern;
         printf("\n\n \t\t\t***** MAIN MENU *****");
         printf("\n\n Select your option: \n 1 : ADD\n 2 : MULTIPLY\n 0 : EXIT \n\n\t\t Enter your Option [  ]\b\b");
         scanf("%d",&opern);
        switch(opern)
         {
            case 0:
            exit(0);
            case 1:
            case 2:
            arithmetic(opern);
            default:
            main();
         }
    }
    void arithmetic(int opern)
    {
        struct comp w1, w2, w;
         printf("\n Enter two Complex Numbers  (x+iy):\n Real Part of First Number:");
         scanf("%lf",&w1.realpart);
         printf("\n Imaginary Part of First Number:");
         scanf("%lf",&w1.imgpart);
         printf("\n Real Part of Second Number:");
         scanf("%lf",&w2.realpart);
         printf("\n Imaginary Part of Second Number:");
         scanf("%lf",&w2.imgpart);
        switch(opern)
         {
            /*addition of complex number*/
            case 1:
             w.realpart = w1.realpart+w2.realpart;
            w.imgpart = w1.imgpart+w2.imgpart;
            break;
            /*multiplication of complex number*/
            case 2:
              w.realpart=(w1.realpart*w2.realpart)-(w1.imgpart*w2.imgpart);
              w.imgpart=(w1.realpart*w2.imgpart)+(w1.imgpart*w2.realpart);
            break;
         }
        if (w.imgpart>0)
          printf("\n Answer = %lf+%lfi",w.realpart,w.imgpart);
        else
          printf("\n Answer = %lf%lfi",w.realpart,w.imgpart);
         getch();
         main();
    }

Comments/Suggestions are invited. Happy coding......!

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