下面是一个Objective-C程序示例，用于检查是否为完数，并打印10000以内的所有完数。

#import 
    
       
BOOL isPerfectNumber(int number) {  
    int sum = 1; // 1是所有数的因数，除了自身  
    int sqrtNumber = sqrt(number);  
    for (int i = 2; i <= sqrtNumber; i++) {  
        if (number % i == 0) {  
            sum += i;  
            int counterpart = number / i;  
            if (counterpart != i) {  
                sum += counterpart;  
            }  
        }  
    }  
    return sum == number;  
}  
int main(int argc, const char *argv) {  
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];  
    int maxNumber = [defaults integerForKey:@"maxNumber" ];  
    if (maxNumber <= 0) {  
        maxNumber = 10000;  
    }  
    for (int number = 1; number <= maxNumber; number++) {  
        if (isPerfectNumber(number)) {  
            printf("%d是一个完数\n", number);  
        } else {  
            printf("%d不是一个完数\n", number);  
        }  
    }  
    return 0;  
}