# Can any one help!!write a c program to find addition and subtraction of complex no:s

#include <stdio.h>
#include <stdlib.h>

struct complex

int real, img;
;

int main()

int choice, x, y, z;
struct complex a, b, c;

while(1)

printf("Press 1 to add two complex numbers. ");
printf("Press 2 to subtract two complex numbers. ");
printf("Press 3 to multiply two complex numbers. ");
printf("Press 4 to divide two complex numbers. ");
printf("Press 5 to exit. ");
scanf("0", &choice);

if (choice == 5)
exit(0);

if (choice >= 1 && choice <= 4)

printf("Enter a and b where a + ib is the first complex number.");
printf(" a = ");
scanf("0", &a.real);
printf("b = ");
scanf("0", &a.img);
printf("Enter c and d where c + id is the second complex number.");
printf(" c = ");
scanf("0", &b.real);
printf("d = ");
scanf("0", &b.img);

if (choice == 1)

c.real = a.real + b.real;
c.img = a.img + b.img;

if (c.img >= 0)
printf("Sum of the complex numbers = 0 + 0i", c.real, c.img);
else
printf("Sum of the complex numbers = 0 0i", c.real, c.img);

else if (choice == 2)

c.real = a.real - b.real;
c.img = a.img - b.img;

if (c.img >= 0)
printf("Difference of the complex numbers = 0 + 0i", c.real, c.img);
else
printf("Difference of the complex numbers = 0 0i", c.real, c.img);

else if (choice == 3)

c.real = a.real*b.real - a.img*b.img;
c.img = a.img*b.real + a.real*b.img;

if (c.img >= 0)
printf("Multiplication of the complex numbers = 0 + 0i", c.real, c.img);
else
printf("Multiplication of the complex numbers = 0 0i", c.real, c.img);

else if (choice == 4)

if (b.real == 0 && b.img == 0)
printf("Division by 0 + 0i isn't allowed.");
else

x = a.real*b.real + a.img*b.img;
y = a.img*b.real - a.real*b.img;
z = b.real*b.real + b.img*b.img;

if (x%z == 0 && y%z == 0)

if (y/z >= 0)
printf("Division of the complex numbers = 0 + 0i", x/z, y/z);
else
printf("Division of the complex numbers = 0 0i", x/z, y/z);

else if (x%z == 0 && y%z != 0)

if (y/z >= 0)
printf("Division of two complex numbers = 0 + 0/0i", x/z, y, z);
else
printf("Division of two complex numbers = 0 0/0i", x/z, y, z);

else if (x%z != 0 && y%z == 0)

if (y/z >= 0)
printf("Division of two complex numbers = 0/0 + 0i", x, z, y/z);
else
printf("Division of two complex numbers = 0 0/0i", x, z, y/z);

else

if (y/z >= 0)
printf("Division of two complex numbers = 0/0 + 0/0i",x, z, y, z);
else
printf("Division of two complex numbers = 0/0 0/0i", x, z, y, z);

else
printf("Invalid choice.");

printf(" Press any key to enter choice again... ");

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