#include<iostream>using namespace std;double result;char k;char putin,put;struct char0{char c;char0 *next;};struct num0{double n;num0 *next;};void sum(num0 *x,char0 *y,char);void dep(num0 *x,char0 *y,char);void mal(num0 *x,char0 *y,char);void div(num0 *x,char0 *y,char);void inchar(char0 *x,char);...