c - 错误: redefinition of random and related compiler errors

Question

#import <Foundation/Foundation.h>

struct {
    double x;
    float yellow;
    double number;

}budget;
struct budget random;    //error: redefinition of random

void color(dollar){

    random.number = random.x - dollar; //error member referance has a base type long(void)not a structure or union.

}

int main(int argc, const char * argv[]){


   random.x = 10;//error member referance has a base type long(void)not a structure or union.
   random.yellow = 1.4;//error member referance has a base type long(void)not a structure orunion
   int dollar = 4; 
   color(newNumber); use of undeclared variable new number.

   NSLog(@"the total budget is %.2f", random.number); //error member referance has a base type long(void)not a structure or union.

   return 0 ;
}

我正在关注 Objective-C 的视频教程:http://www.youtube.com/watch?v=RsXivZEU9rc&list=SP54515103C712A53D&index=19 ，并且我已经尝试了我能想到的所有方法，但是此代码不会返回 random.number 总计，这将是 random.x-dollar 如中所述函数color()。然后，我在 main 中调用 color() 并重命名了它的参数，它应该在函数中复制 dollar 并返回它，但事实并非如此。这是怎么回事？

Answer 1

我因为工作原因无法观看视频，但你正在重新定义“随机”。尝试用其他名称替换变量“随机”。其余的错误只是从第一个错误(您对随机的重新定义)开始级联。