#include<stdio.h>
#include<conio.h>
#include<math.h>
#include<stdlib.h>
#include <ctype.h>

void optionTray();
void secondOptionTray();

void addition()
{printf("\nEnter nos. to add separated by space_ || press Enter ┘ for solution \n\n");
int input=0; int ans=0; char c='\0';
while(c!='\n'){
scanf("%d", &input);
ans+= input;
c=getchar();

}
printf("\n = %d",ans);
secondOptionTray();

}

void subtraction ()
{
int first, second; int ans = 0;
printf ("\nEnter the first number : ");
scanf ("%d", &first);
printf ("Enter the second number : ");
scanf ("%d", &second);
ans=first - second;
printf ("\n = %d", ans);
secondOptionTray();
}

void multiplication ()
{
printf("\nEnter nos. to multiply separated by space_ || press Enter ┘ for solution \n\n");
int input=0; int ans=1; char c='\0';
while(c!='\n'){
scanf("%d", &input);
ans*= input;
c=getchar();

}
printf("\n = %d",ans);
secondOptionTray();

}

void division ()
{
int dend, isor=0;char c='\0';
printf ("\nEnter the Dividend: ");
scanf ("%d", &dend);
printf ("Enter the Divisor: ");
scanf ("%d", &isor);
int ans = dend / isor;
printf ("\nQuotient is = %d", ans);
printf("\nRemainder is");
printf(" = %d", (dend%isor));
secondOptionTray();
}

void power ()
{
double base, exponent, ans;
printf ("\nEnter the Base: ");
scanf ("%lf", &base);

printf ("Enter the Exponent(Power): ");
scanf ("%lf", &exponent);

ans = pow (base, exponent);
printf ("\n = %lf", ans);
secondOptionTray();
}

void sqroot()
{

double input;
printf("\nEnter no. for Square Root: ");

    scanf("%lf", &input);
    printf("\n = %lf", sqrt(input));
    secondOptionTray();

}

void cbroot(){
double input;
printf("\nEnter no. for Cube Root: ");
scanf("%lf", &input);
printf("\n = %lf", cbrt(input));
secondOptionTray();
}

void factorial ()
{
int input, fact = 1;

printf ("\nEnter a number to find factorial : ");
scanf ("%d", &input);

if (input < 0)
printf ("\nPlease enter a positive number..");
if (input == 0)
printf("\n = 1");
else{
for (int x = 1; x <= input; x++){
fact = fact * x;}

  printf ("\n = %d", fact);

}secondOptionTray();

}

//**************************************

int main ()
{

char choice='\0';

printf ("\n\t\t\t\tWelcome to C calculator\n\n");
optionTray();

while (1>0)
{

  choice= getchar();

  switch (choice)
{
    case '1':
    case '+':
    addition ();break;

case '-':
case '2':
subtraction ();
break;

case '*':
case '3':
  multiplication ();
  break;

case '/':
case '4':
  division ();
  break;

case '^':
case '5':
    power();
    break;

case '|':
case '6':
  sqroot();
  break;

case '~':
case '7':
  cbroot();
  break;

case '!':
case '8':
  factorial();
  break;

case 'M':
case 'm':
optionTray();break;

case 's':
case 'S':
exit(0);break;

}

}

}

void secondOptionTray()
{

printf ("\n\n## Press 's' to stop ##");

printf("\n\n## Press 'm' for Full Option Menu ## ");

}

void optionTray()
{

secondOptionTray();

printf ("\n\n\nEnter '+' or '1' for Addition");
printf ("\t\t\t\tEnter '-' or '2; for Subtraction");
printf ("\nEnter '*' or '3' for Multiplication");
printf ("\t\t\tEnter '/' or '4' for Division");
printf ("\nEnter '^' or '5' for Power");
printf ("\t\t\t\tEnter '|' or '6' for Square Root");
printf ("\nEnter '~' or '7' for Cube Root");
printf ("\t\t\t\tEnter '!' or '8' for Factorial \n\n");

printf ("\n\n\n\nEnter the option you wish to perform — ");
}