If statement

You can't have one if statement because there are 3 outcomes. At best you can have 2 if statements:

if(age > 64)
  // senior
else if(age >= 18)
  // adult
else
  // minor

Dec 17, 2009 at 5:00am

here is an extended if statement (if/else/else) , technically it is a single if statement


#include <iostream>;
using namespace std;

int main()
{
int a;

cout << "enter Age:\n";
cin >> a;
if(a>=18 &a <=64)cout << "adult\n"; 
else if(a<=17)cout<< "minor\n"; 
else cout<< "senior\n";


return 0;
}

Edit & run on cpp.sh

Last edited on Dec 17, 2009 at 5:04am

Dec 17, 2009 at 5:07am

technically it is a single if statement

Can you explain?

I count two statements that have "if" in them.

Dec 17, 2009 at 5:21am

sure, the original 'if' statement is the catalyst, the else statements are conditional expressions related to the original, as soon as the first else/if expression in the ladder is found true, then all following else ifs in the ladder are disregarded(even if they are true as well), therefore they are inherent to the original if statement and not independent, if no else statement is found true it the default statement at the end of the ladder is usually just that a default output and why the program works. it IS an extended if expression

Last edited on Dec 17, 2009 at 5:23am

Dec 17, 2009 at 5:22am

but the two ifs are still two different statements, are they not?

Whatever. I'm nitpicking about something that really doesn't matter.

Nevermind me. Goodnight!

Dec 17, 2009 at 5:40am

lol ok, , and have a good night btw :D but tell me why this program wont display all if's statements they are all true? because they are part of an extended if statement.


#include <iostream>;
using namespace std;

int main()
{
int a;

a=4;

     if(a==4)cout << "you wont read anything beyond this even though the following if statements are all true\n"; 
else if(a==4)cout << "just\n"; 
else if(a==4)cout << "making\n"; 
else if(a==4)cout <<"my \n";
else if(a==4)cout << "point\n"; 
else if(a==4)cout <<"lol\n";

return 0;
}

Edit & run on cpp.sh

Dec 17, 2009 at 5:43am

firedraco (6245)

What you are doing is basically this:

#include <iostream>;
using namespace std;

int main()
{
    int a = 4;
    if(a == 4) //#1
    else {
        if(a == 4) //#2
        else {
            //etc
        }
    }
    return 0;
}

Edit & run on cpp.sh

Dec 17, 2009 at 5:44am

yes

Dec 17, 2009 at 2:00pm

jsmith (5804)

std::cout << ( age < 18 ? "Minor" : age > 65 ? "Senior" : "Adult" ) << std::endl;

Dec 18, 2009 at 1:46am

chrisname (7395)

Conditional operator pwns.

Dec 18, 2009 at 3:13am

oh that's cool, I thought it could only be used in cases of if/else but I'm guessing if the above works then you can have multiple if/else if/else if/else if/else if/else statements. assuming you stay approx around/below the 80 char limit.

Dec 18, 2009 at 3:19am

helios (17607)

What 80 characters limit?

EDIT:

because they are part of an extended if statement.

There's no such thing as "extended if statement". Only the first true block is executed because all the other if statements are inside the false block of the outermost (i.e. the first) if statement.

Last edited on Dec 18, 2009 at 3:22am

Dec 18, 2009 at 3:30am

80 char limit for printers. I usually try to keep my code below this. so for example a cout statement that is 300 chars long can be broken up and put on 4-5lines; eg.

cout << "Hello World, My name is " << name << ". I like to dance on the moon with "
      << alien_Name << endl << "Because he teaches me lots of cool things like: " 
      << move1 << " and " << move2 << " and " << move78 << "." << endl 
      << "Also he has great alien weed, and a " << alien_spaceship << endl;

as far as C++ goes, you can pretty much have a 5000 line program on the 1 line. But it's pretty damn poor practice and virtually impossible to read.

I guess the question should be asked can you include whitespace (newlines) within extended if's?
condition ? function : condition ?
function : condition ? function : function

Last edited on Dec 18, 2009 at 3:37am

Dec 18, 2009 at 3:48am

people actually print sourcecode?

I find that restricting myself to 80 char line width is a little absurd. Especially considering the resolution and size of modern monitors.

Dec 18, 2009 at 3:50am

helios (17607)

I guess the question should be asked can you include whitespace (newlines) within extended if's?

Duh.

extended if

Grr...

Last edited on Dec 18, 2009 at 3:51am

Dec 18, 2009 at 3:58am

what do you call it then, if not 'extended if'?

people actually print sourcecode?

yep, people use text books too.

Last edited on Dec 18, 2009 at 4:02am

Dec 18, 2009 at 4:38am

helios (17607)

Trinary operator, ternary operator, or conditional operator.

Limiting yourself to 80 characters doesn't make sense unless you expect to read your code on a console or you're going to print it with a dot matrix printer.

Dec 18, 2009 at 10:33am