If Else in Objective-C

Branching with if and else in Objective-C is straightforward.

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // Here's a basic example.
        if (7 % 2 == 0) {
            NSLog(@"7 is even");
        } else {
            NSLog(@"7 is odd");
        }
        
        // You can have an `if` statement without an else.
        if (8 % 4 == 0) {
            NSLog(@"8 is divisible by 4");
        }
        
        // Logical operators like `&&` and `||` are often useful in conditions.
        if (8 % 2 == 0 || 7 % 2 == 0) {
            NSLog(@"either 8 or 7 are even");
        }
        
        // A statement can precede conditionals; any variables
        // declared in this statement are available in the current
        // and all subsequent branches.
        int num = 9;
        if (num < 0) {
            NSLog(@"%d is negative", num);
        } else if (num < 10) {
            NSLog(@"%d has 1 digit", num);
        } else {
            NSLog(@"%d has multiple digits", num);
        }
    }
    return 0;
}

To run the program, compile and execute it:

$ clang -framework Foundation if-else.m -o if-else
$ ./if-else
7 is odd
8 is divisible by 4
either 8 or 7 are even
9 has 1 digit

Note that in Objective-C, you need parentheses around conditions, and braces are required for multi-line blocks. Single-line blocks can omit braces, but it’s generally recommended to always use them for clarity and to prevent errors.

Objective-C does have a ternary operator (?:), which can be used for simple conditional expressions. However, for more complex conditions, a full if statement is often clearer and more maintainable.

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If Else in Objective-C