program.c

//C Program

#include <stdio.h>

void main()
{   
    int choice, calculatorChoice,exit = 1;
    float num1, num2,result;
    int number;

    void isPrime(int n);
    void isAmstromg(int n);
    void printFactorial(int n);


    while(exit)
    {
        printf("\n1. Binary Calculator \n2. Number Functions\n3. Exit");
        printf("\nEnter a choice : ");
        scanf("%d",&choice);

        switch(choice)
        {
            case 1:
                printf("\nEnter number I : ");
                scanf("%f",&num1);
                printf("Enter number II : ");
                scanf("%f",&num2);

                printf("\n1. Addition (+) \n2. Subtraction (-)\n3. Multiplication (*)\n4. Division(/)\n");
                printf("\nEnter a choice : ");
                scanf("%d",&calculatorChoice);

                switch (calculatorChoice)
                {
                case 1:
                    result = num1 + num2;
                    printf("%.2f + %.2f = %.2f\n",num1,num2,result);
                    break;
                case 2:
                    result = num1 - num2;
                    printf("%.2f - %.2f = %.2f\n",num1,num2,result);
                    break;
                case 3:
                    result = num1 * num2;
                    printf("%.2f * %.2f = %.2f\n",num1,num2,result);
                    break;
                case 4:
                    result = num1 / num2;
                    printf("%.2f / %.2f = %.2f\n",num1,num2,result);
                    break;
                
                default:
                    printf("\nError! Enter Proper Choice...");
                    break;
                }
            break;

            case 2:
                //number fn implementation here
                break;

            case 3:
                exit=0;
                break;
    }


    }

}