You can use star topology which has the benefit of easy installation and reconfiguration of access nodes. It reduces the overall network cost and makes network management much easier.

Star network topology is the most commonly used topology. It is laid out to make sure every node in the network is directly connected to a single central hub. It is done via either fibre optic cable or coaxial, twisted pair cables.

The main benefit of star topology is its ability to prevent data loss. All the data transmission is managed by the central hub and also contributes as a repeater.

Code:

#include <stdio.h>
int main()
{
char operator;
double first, second;
printf("Enter an operator (+, -, , /): ");
scanf("%c", &operator);
printf("Enter two operands: ");
scanf("%lf %lf", &first, &second);
switch(operator)
{
case '+':
printf("%.1lf + %.1lf = %.1lf", first, second, first + second);
break;
case '-':
printf("%.1lf - %.1lf = %.1lf", first, second, first - second);
break;
case '*':
printf("%.1lf * %.1lf = %.1lf", first, second, first * second);
break;
case '/':
printf("%.1lf / %.1lf = %.1lf", first, second, first / second);
break;
// when operator doesn't match any case constant
default:
printf("Error! operator is not correct");
}
}