A sample C programming code for a real time calculator application program is given below

// Calculator example using C code
#include<stdio.h>
#include<conio.h>
#include<math.h>
#include<stdlib.h>
 
#define KEY "Enter the calculator Operation you want to do:"
 
// Function prototype declaration
void addition();
void subtraction();
void multiplication();
void division();
void modulus();
void power();
int factorial();
void calculator_operations();
 
// Start of Main Program
int main()
{
    int X=1;
    char Calc_oprn;
 
    // Function call
    calculator_operations();
 
    while(X)
    {
        printf("\n");
        printf("%s : ", KEY);
 
        Calc_oprn=getche();
 
        switch(Calc_oprn)
        {
            case '+': addition();
                      break;
 
            case '-': subtraction();
                      break;
 
            case '*': multiplication();
                      break;
 
            case '/': division();
                      break;
 
            case '?': modulus();
                      break;
 
            case '!': factorial();
                      break;
 
            case '^': power();
                      break;
 
            case 'H':
            case 'h': calculator_operations();
                      break;
 
            case 'Q':
            case 'q': exit(0);
                      break;
            case 'c':
            case 'C': system("cls");
                      calculator_operations();
                      break;
 
            default : system("cls");
 
    printf("\n**********You have entered unavailable option");
    printf("***********\n");
    printf("\n*****Please Enter any one of below available ");
    printf("options****\n");
                      calculator_operations();
        }
    }
}
 
//Function Definitions
 
void calculator_operations()
{
    //system("cls");  use system function to clear
    //screen instead of clrscr();
    printf("\n             Welcome to C calculator \n\n");
 
    printf("******* Press 'Q' or 'q' to quit ");
    printf("the program ********\n");
    printf("***** Press 'H' or 'h' to display ");
    printf("below options *****\n\n");
    printf("Enter 'C' or 'c' to clear the screen and");
    printf(" display available option \n\n");
 
    printf("Enter + symbol for Addition \n");
    printf("Enter - symbol for Subtraction \n");
    printf("Enter * symbol for Multiplication \n");
    printf("Enter / symbol for Division \n");
    printf("Enter ? symbol for Modulus\n");
    printf("Enter ^ symbol for Power \n");
    printf("Enter ! symbol for Factorial \n\n");
}
 
void addition()
{
    int n, total=0, k=0, number;
    printf("\nEnter the number of elements you want to add:");
    scanf("%d",&n);
    printf("Please enter %d numbers one by one: \n",n);
    while(k<n)
    {
        scanf("%d",&number);
        total=total+number;
        k=k+1;
    }
    printf("Sum of %d numbers = %d \n",n,total);
}
 
void subtraction()
{
    int a, b, c = 0;
    printf("\nPlease enter first number  : ");
    scanf("%d", &a);
    printf("Please enter second number : ");
    scanf("%d", &b);
    c = a - b;
    printf("\n%d - %d = %d\n", a, b, c);
}
 
void multiplication()
{
    int a, b, mul=0;
    printf("\nPlease enter first numb   : ");
    scanf("%d", &a);
    printf("Please enter second number: ");
    scanf("%d", &b);
    mul=a*b;
    printf("\nMultiplication of entered numbers = %d\n",mul);
}
 
void division()
{
    int a, b, d=0;
    printf("\nPlease enter first number  : ");
    scanf("%d", &a);
    printf("Please enter second number : ");
    scanf("%d", &b);
    d=a/b;
    printf("\nDivision of entered numbers=%d\n",d);
}
 
void modulus()
{
    int a, b, d=0;
    printf("\nPlease enter first number   : ");
    scanf("%d", &a);
    printf("Please enter second number  : ");
    scanf("%d", &b);
    d=a%b;
    printf("\nModulus of entered numbers = %d\n",d);
}
 
void power()
{
    double a,num, p;
    printf("\nEnter two numbers to find the power \n");
    printf("number: ");
    scanf("%lf",&a);
 
    printf("power : ");
    scanf("%lf",&num);
 
    p=pow(a,num);
 
    printf("\n%lf to the power %lf = %lf \n",a,num,p);
}
 
int factorial()
{
    int i,fact=1,num;
 
    printf("\nEnter a number to find factorial : ");
    scanf("%d",&num);
 
    if (num<0)
    {
        printf("\nPlease enter a positive number to");
        printf(" find factorial and try again. \n");
        printf("\nFactorial can't be found for negative");
        printf(" values. It can be only positive or 0  \n");
        return 1;
    }              
 
    for(i=1;i<=num;i++)
    fact=fact*i;
    printf("\n");
    printf("Factorial of entered number %d is:%d\n",num,fact);
    return 0;
}