Arlus

#include <stdio.h>
int main()
{
    int n, i;
    unsigned long long factorial = 1;
    printf("Enter an integer: ");
    scanf("%d",&n);
    // show error if the user enters a negative integer
    if (n < 0)
        printf("Error! Factorial of a negative number doesn't exist.");

Arlus

Example Remote Procedure Call(RPC)

import rpyc
conn = rpyc.classic.connect("localhost")
conn.execute("print('Hello from Tutorialspoint')")

Example SOAP
SOAP used XML to encode a message and HTTP as a transport.
<SOAP-ENV:Envelope