Newbie Help! - "Request for member ' ' in something not a structure or a union"

[Lordtunk]

*I'm a complete beginner to programming! Also I'm coding on a Mac with Xcode so it's Objective C [if that makes any difference]*

This error keeps coming up everytime I try to build and I have no idea how to remedy it. Any thoughts?

Code:

#import <Foundation/Foundation.h>
 
typedef struct {
    int alpha;
    int beta;
    int delta;
} greek;
 
greek letters;
 
void tester1 (int value) {    
 
    letters.beta *= letters.delta;
};
 
void tester2 (int letters) {
 
    letters += letters.beta;  <<- Error appears in this line
 
};    
 
int main (int argc, const char * argv[]) {        
 
    letters.alpha = 8;
    letters.beta = 4;
    letters.delta = 22;        
 
    tester2(letters.alpha);
    NSLog(@"answer equal to %f", letters.alpha, letters.beta);
 
    return 0;
}

[Rabbit]

You've declared letters twice. You have a greek letters and an int letters.