#include <stdio.h>
#include <stdlib.h>
int main()
{
int x;
int y;
int answer;
int operationType;
printf("Welcome to Vladimir's calculator \n");
printf("What do you want me to do? \n 1.add ; 2.subtrack ; 3.devide ; 4.multiply \n");
scanf(" %d \n", &operationType)...