c - 我在一本使用 Xcode 的教科书中发现运行 C 程序时出错。

Question

我实际上按照我用来学习 C 的教科书中的方式编写了这段代码。我不确定这些错误意味着什么或从哪里开始。请帮忙。我正在使用 Xcode。

//  Specific Age Calculator
//
//  Created by Christopher Pettit on 10/11/17.
//  Copyright © 2017 Christopher Pettit. All rights reserved.

#include <stdio.h>
#define TARGET_AGE 88

int year1, year2;

int calcYear(int year1);


int main(void)
{
    // Ask the user for their birth year
    printf("What year were you born?\n");
    printf("Enter as a 4-digit year (YYYY) " );
    scanf(" %d", &year1);

    // Calculate the future year and display it
    year2 = calcYear(year1);

    printf("Since you were born in %d, you will be %d in %d. ", 
    year1,TARGET_AGE,year2);

    return 0;

    // This function to get the future year
    int calcYear (int year1);

 {
    return (year1+TARGET_AGE);
 }

}

This is the error that Xcode produces

Answer 1

花括号放错了位置。因此，函数 calcYear 未定义，因为它隐藏在 main 中。

在不解释程序含义的情况下，只是为了修复链接器错误，该错误表示没有 calcYear 的定义，代码可能如下所示:

    return 0;
}  // this one inserted

    // This function to get the future year
    int calcYear (int year1)   // ; this semicolon was deleted

 {
    return (year1+TARGET_AGE);
 }

//}  this one deleted