READM.md

calc

#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+=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;

}