跪求c++中term does not evaluate to a function的意思，急啊！！！！！

#include<iostream>
#include<stdio.h>
#include <conio.h>
void menu()/*菜单*/
{
char clrscr();
printf("\n===============================================================================");
printf("\n1.Encrypt the file");
printf("\n2.Decrypt the file");
printf("\n3.Quit\n");
printf("===============================================================================\n");
printf("Please select a item:");
return;
}
char encrypt(char ch1,char ch2)/*加密程序*/
{
if(ch1>='A'&&ch1<='Z'&&ch2>='A'&&ch2<='Z')
{
return 'A'+(ch1-'A'+ch2-'A')%26;
}
if(ch1>='a'&&ch1<='z'&&ch2>='a'&&ch2<='z')
{
return 'a'+(ch1-'a'+ch2-'a')%26;
}
return ch1;
}
char

#include<iostream>
#include<stdio.h>
#include <conio.h>
void menu()/*菜单*/
{
char clrscr();
printf("\n===============================================================================");
printf("\n1.Encrypt the file");
printf("\n2.Decrypt the file");
printf("\n3.Quit\n");
printf("===============================================================================\n");
printf("Please select a item:");
return;
}

char encrypt(char ch1,char ch2)/*加密程序*/
{
if(ch1>='A'&&ch1<='Z'&&ch2>='A'&&ch2<='Z')
{
return 'A'+(ch1-'A'+ch2-'A')%26;
}
if(ch1>='a'&&ch1<='z'&&ch2>='a'&&ch2<='z')
{
return 'a'+(ch1-'a'+ch2-'a')%26;
}
return ch1;
}