#include <stdio.h>
#include <stdlib.h>
/* Lets define our functions */
int add(int a, int b);
int sub(int a, int b);
int mult(int a, int b);
int divide(int a, int b);
int remain(int a, int b);
void ask2run();
/* ************************* */

int main()
{
    /* MENU */

    printf("==================================== \n");
    printf("|********** CALCULATOR ************| \n");
    printf("\n");
    printf("|   BY.....Aditya Patange....      | \n");
    printf("\n");
    printf("|**********************************| \n");
    printf("|        (1) Addition              | \n");
    printf("|        (2) Subtraction           | \n");
    printf("|        (3) Multiplication        | \n");
    printf("|        (4) Division              | \n");
    printf("|**********************************| \n");
    printf("\n\n");
    printf("** Enter your option ** \n");
    int i;
    scanf("%d", &i);

    /* END MENU */

    if (i == 1) //Addition
    {
        printf("\n\n");
        printf(" ** ADDITION ** \n");
        int add1;
        int add2;
        printf("Enter the first number: \n");
        scanf("%d", &add1);
        printf("Enter the second number: \n");
        scanf("%d", &add2);
        int sum;
        sum = add(add1,add2);
        printf("%d + %d = %d\n",add1,add2,sum);
        ask2run();
        return 0;
    }

    if (i == 2) //Subtraction
    {
        printf("\n\n");
        printf(" ** SUBTRACTION ** \n");
        int sub1;
        int sub2;
        int diff;
        printf("Enter the first number:\n");
        scanf("%d", &sub1);
        printf("Enter the number to subtract from first number:\n");
        scanf("%d", &sub2);
        diff = sub(sub1,sub2);
        printf("%d - %d = %d\n", sub1, sub2, diff);
        ask2run();
        return 0;
    }

    if (i == 3) //Multiplication
    {
        printf("\n\n");
        printf(" ** MULTIPLICATION ** \n");
        int multi1;
        int multi2;
        int prod;
        printf("Enter the first number \n");
        scanf("%d", &multi1);
        printf("Enter the second number \n");
        scanf("%d", &multi2);
        prod = mult(multi1,multi2);
        printf("%d * %d = %d\n", multi1, multi2, prod);
        ask2run();
        return 0;
    }

    if (i == 4) //Division
    {
        printf("\n\n");
        printf(" ** DIVISION ** \n");
        int dividend;
        int divisor;
        int quotient;
        int remainder;
        printf("Enter your dividend \n");
        scanf("%d", &dividend);
        printf("Enter your divisor \n");
        scanf("%d", &divisor);
        quotient = divide(dividend,divisor);
        remainder = remain(dividend,divisor);
        printf("Your quotient is %d \n", quotient);
        printf("Your remainder is %d \n", remainder);
        ask2run();
        return 0;

    }

return 0;
}




/* Functions */

int add(int a, int b)
{
    int sum;
    sum = a + b;
    return(sum);
}

int sub(int a, int b)
{
    int sub;
    sub = a - b;
    return(sub);
}

int mult(int a, int b)
{
    int prod;
    prod = a * b;
    return(prod);
}

int divide(int a, int b)
{
    int quo;
    quo = a / b;
    return (quo);
}

int remain(int a, int b)
{
    int rem;
    rem = a % b;
    return(rem);
}

void ask2run() //Whether the user wants to run it again..
               //Loop back to main()
{
    printf("\n\n");
    printf("Would you like to run the program again ? \n");
    printf("Press Y for yes and N for no.");
    fflush(stdin);
    char choice;
    scanf("%c", &choice);

    if (choice == 'Y' || choice == 'y')
    {
         printf("\n\n\n\n\n\n\n\n\n\n\n");
         main();
    }
    if (choice == 'N' || choice == 'n')
    {
    /* Do nothing bitch, just quit because abort() is just too mainstream */
    }
    else
    {
        printf("\n\n\n\n\n\n\n\n\n\n\n");
        main();
    }
}