Aim: To perform computer exponential airthmatic (Addition, Subtraction, Multiplication, Divison)

#include<stdio.h>

#include<math.h>

void main()

{

    int ch;

    float e1,e2,x1,x2,k,E,x;

   printf("Enter first number in FPR. \n");

    scanf("%f%f",&x1,&e1);

    printf("Enter second number in FPR. \n");

    scanf("%f%f",&x2,&e2);

    k=fabs(e1-e2);

    if(e1>e2)

    {

        x2=x2/(pow(10,k));

        E=e1;

    }

    else

    {

        x1=x1/(pow(10,k));

        E=e2;

    }

    printf("Enter : \n1 - Addition \n2 - Subtraction \n3 - Multiplication \n4 - Division \n");

    scanf("%d",&ch);

    switch(ch)

    {

        case 1 :

        {

            x=x1+x2;

            if(x>0.1)

            {

                x1=x1/10;

                E=E+1;

            }

            printf("%fe%f ",x,E);

            break;

        }

        case 2 :

        {

            x=fabs(x1-x2);

            if(x<0.1)

            {

                x1=x1*10;

                E=E-1;

            }

            printf("%fe%f ",x,E);

            break;

        }

        case 3 :

        {

            x=fabs(x1*x2);

            E=e1+e2;

            printf("%fe%f ",x,E);

            break;

        }

        case 4 :

        {

            x=x1/x2;

            E=e1-e2;

            if(e1>99)

            {

                printf("Overflow.");

            }

            if(e1<-99)

            {

                printf("Underflow.");

            }

            printf("%fe%f ",x,E);

            break;

        }

        default :

        {

            printf("Invalid Choice. \n");

        }

    }

}