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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

/* 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
#include


void arithmetic(int opern);

struct comp
{
double realpart;
double imgpart;
};

void main()
{
int opern;
clrscr();
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();
}

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