未初始化的局部变量tc使用（错误） [英] Uninitialized local variable tc used ( error)

问题描述

  struct  dat 
 {
  int 天; 
  int 月; 
  int 年; 
  int  cday; 
  int  cmonth; 
  int  cyear; 
}; 
  void  dob（）
 {
 dat d; 
 
 cout<<  输入出生日期; 
 
 cout<< ENDL; 
 
 cout<<  输入日期; 
 cin>> d.day; 
 cout<< ENDL; 
 cout<<   month; 
 cin>> d.month; 
 cout<< ENDL; 
 cout<<   year; 
 cin>> d.year; 
 cout<< ENDL; 
 cout<< d。一天<<    - << d.month<<    - << d.year; 
 cout<< ENDL; cout<< ENDL; 
} 
  void  cdob（）
 {
 dat cd; 
 
 cout<<  输入当前日期; 
 
 cout<< ENDL; 
 
 cout<<  输入日期; 
 cin>> cd.day; 
 cout<< ENDL; 
 cout<<   month; 
 cin>> cd.month; 
 cout<< ENDL; 
 cout<<   year; 
 cin>> cd.year; 
 cout<< ENDL; 
 cout<< cd.day<<    - << cd.month<<    - << cd.year; 
 cout<< ENDL; cout<< ENDL; 
} 
  void  tdob（）
 {
 dat tc; 
  int  tyear; 
 tyear = tc.cyear  -  tc.year-  1 ; 
  int 天; 
 days = tc.day  -  tc.cday; 
  int  tmonth; 
 tmonth = tc.month + tc.cmonth; 
 cout<<   year =<< tyear; 
 cout<< ENDL; 
 cout<<  总天数<<天; 
 cout<< ENDL; 
 cout<<  总月份<< tmonth; 
 cout<< ENDL; 
 
 
} 
  void  main（）
 {
 dob（）; 
 cdob（）; 
 tdob（）; 
} 

我的尝试：

  void  tdob（）
 {
 dat tc; 
  int  tyear; 
 tyear = tc.cyear  -  tc.year-  1 ; 
  int 天; 
 days = tc.day  -  tc.cday; 
  int  tmonth; 
 tmonth = tc.month + tc.cmonth; 
 cout<<   year =<< tyear; 
 cout<< ENDL; 
 cout<<  总天数<<天; 
 cout<< ENDL; 
 cout<<  总月份<< tmonth; 
 cout<< ENDL; 
} 

解决方案

错误信息非常明确：

使用未初始化的本地变量tc 

快速浏览一下代码即可确认：

 dat tc; 
 int tyear; 
 tyear = tc.cyear  -  tc.year-1; 
 

你在第一行宣布 tc ，你在第三行使用它 - 但是你没有给它一个值。

我怀疑你想要做的是 dob 返回用户输入的值，然后将其传递给 cdob 作为参数（可能替换 cd ， tdob 相同 - 但这是你的代码，所以你会知道，不是我！

Quote：

未初始化的局部变量tc使用（错误）

这意味着您使用 tc 执行某些操作，但其值为random / unknown，因为您未设置该值之前。

struct dat
{
	int day;
int month;
		int year;
		int cday;
			int cmonth;
			int cyear;
};
void dob()
{
	dat d;

	cout << " enter date of birth";
	
		cout << endl;
	
		cout << " enter day";
		cin >> d.day;
		cout << endl;
		cout << " month";
		cin >>d.month;
		cout << endl;
		cout << "year";
		cin >> d.year;
		cout << endl;
		cout <<d. day << "-" << d.month << "-" <<d.year;
		cout << endl; cout << endl;
}
void cdob()
{
	dat cd;

	cout << " enter  current date ";

	cout << endl;

	cout << " enter day";
	cin >> cd.day;
	cout << endl;
	cout << " month";
	cin >> cd.month;
	cout << endl;
	cout << "year";
	cin >> cd.year;
	cout << endl;
	cout << cd.day << "-" << cd.month << "-" << cd.year;
	cout << endl; cout << endl;
}
void tdob()
{
	dat tc;
	int tyear;
		tyear = tc.cyear - tc.year-1;
		int  days;
		days = tc.day - tc.cday;
		int tmonth;
		tmonth = tc.month + tc.cmonth;
		cout << " year = " << tyear;
		cout << endl;
		cout << " total days" << days;
		cout << endl;
		cout << "total month" << tmonth;
		cout << endl;


}
void main()
{
	dob();
	cdob();
	tdob();
}

What I have tried:

void tdob()
{
	dat tc;
	int tyear;
		tyear = tc.cyear - tc.year-1;
		int  days;
		days = tc.day - tc.cday;
		int tmonth;
		tmonth = tc.month + tc.cmonth;
		cout << " year = " << tyear;
		cout << endl;
		cout << " total days" << days;
		cout << endl;
		cout << "total month" << tmonth;
		cout << endl;
}

解决方案

The error message is very explicit:

Uninitialized local variable tc used

A quick glance at your code confirms this:

dat tc;
int tyear;
    tyear = tc.cyear - tc.year-1;

You declare tc on the first line, you use it on the third - but at no time do you give it a value.
I suspect that what you want to do is have dob return the value the user entered, then pass that to cdob as a parameter (probably replacing cd, and the same for tdob - but it's your code, so you would know that, not me!

Quote:

Uninitialized local variable tc used ( error)

This means that you do something with tc but its value is random/unknown because you didn't set the value before.

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