Error else with out a previous if?

[stevencalabrese]

#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{

char letter;
cout << "Enter a character? ";
cin >> letter;

if (islower(letter));
{
cout << "\n The letter is a lower case " << letter << endl;
cout <<"The upper case equivalent is "<< static_cast<char> (toupper(letter)) <<endl;

else if
{

cout << "\n The letter is a Upper case " << letter << endl;
cout<<"The lower case equivalent is "<< static_cast<char> (tolower)letter)) <<endl;
}
}
if (isalpha(letter));
cout << "\nThe character is a letter" << endl;

if (isalnum(letter));
cout << "\nThe character is a number and a letter" << endl;

system("pause");
return 0;
}

[LB]

If you have a semicolon after an if statement, it counts as the one-liner statement and effectively nullifies your if statements. You have a semicolon after just about all of your if statements.

Also, either it's "else" or "else if(...)", not just "else if"

[Silvestar]

this belongs to beginner subforum...
anyway int this line

if (islower(letter));

remove that ';'

and here

if (islower(letter)) //note that i deleted that ';'
{
cout << "\n The letter is a lower case " << letter << endl; 
cout <<"The upper case equivalent is "<< static_cast<char> (toupper(letter)) <<endl; 
// check out where your else if is.... (INSIDE the code where if is true)
          else if
         {

           cout << "\n The letter is a Upper case " << letter << endl; 
          cout<<"The lower case equivalent is "<< static_cast<char>(tolower)letter)) <<endl; 
          }
}

else if must be out of braces, so this is correct way

if (islower(letter))
{/*beginning of code where if is true*/
cout << "\n The letter is a lower case " << letter << endl; 
cout <<"The upper case equivalent is "<< static_cast<char> (toupper(letter)) <<endl; 
}/*end of code where if is true*/
else if (...) /*note that i added braces and three dots (instead of dots place the condition), if u dont have condition for that part of code remove if and remove braces with dots*/
{//note that u had put this code INSIDE the code where if is true, so it couldn't find if to bind
cout << "\n The letter is a Upper case " << letter << endl; 
cout<<"The lower case equivalent is "<< static_cast<char> (tolower)letter)) <<endl; 
}