跳过数组中的元素 [英] skipping an element in an array

问题描述

我有一个小程序，没有菜单（只有选项1,2和6正在工作

现在）

奇怪的事情正在发生，我的阵列工作到输入用户输入的所有数据

输入，但是我选择选项2，显示，它总是给我4202717

为数组中的元素编号1，而0 ，2,3 ..都没关系。

它似乎是在数组中跳过1号。

任何人？

问题在于createTime（）函数


我使用的是visual c ++

ken

#include< iostream>

#include< conio.h>

使用命名空间std;


class timeChange

{

public：

void createTime（）;

void display1（）;


private：

int t1，t2，i，j，a [];

};


inline void timeChange :: createTime（）

{


if（t1> 0）

{

cout<<""输入数字1： << endl;

cin>> t2;

i = 0;

i = i + j;

do {

cout<<""在j之前： << j<< endl;

cout<<" a [i]： << a [i]<< endl;

cout<<"" t2： << t2<< endl;

cout<<"在我之前： << i<< endl;

i ++;

a [i] = t2;

j = i;

COUT<<" j： << j<< endl;

cout<<" a [i]： << a [i]<< endl;

cout<<"" t2： << t2<< endl;

cout<<"我： <<我<< endl;

}

而（t1< 0）;


}


else

{

cout<<""输入数字2： << endl;

cin>> t1;

i = 0;

do {

a [i] = t1;

cout<<" ;在j之前： << j<< endl;

cout<<" t1： << t1<< endl;

cout<<"我： <<我<< endl;

cout<<" a [i]： << a [i]<< endl;

cout<<""在i ++之前： << i<< endl;

i ++;

j = i;


cout<<" j： << j<< endl;

cout<<" t1： << t1<< endl;

cout<<"我： <<我<< endl;

}

而（t1< 0）;

} //结束其他


} //结束无效功能

内联void timeChange :: display1（）

{


COUT<<"这是： << t1<< endl;

for（int i = 0; i< = j; i ++）


{

cout<<" a [i]：" << a [i]<< endl;

cout<<" i：" << i<<结束;

}


}


/ * inline void timeChange :: diffTime（）

inline void timeChange :: substracTime（）

inline void timeChange :: addTime（）

inline void timeChange :: validateTime（）

* /

void menu（）//显示4个选项的菜单

{timeChange time;

int choice;


做{

cout<< endl<< endl;

cout<< "时间管理系统<< endl;

cout<< ============================================= = << endl;

cout<< " 1：创建一个新的时间对象<< endl;

cout<< " 2：显示所有时间对象<< endl;

cout<< " 3：计算两次之间的差值<< endl;

cout<< " 4：从时间<<<< endl;

cout<<<< " 5：在一段时间内添加一个秒数<<< endl;

cout<< " 6：退出"<< endl;

cout<< ============================================= = << endl;


cout<< "您的选择请：;

cin>>选择;


开关（选择）

{

案例1：

time.createTime（ ）;

//调用函数将秒转换为小时

休息;

案例2：

时间。 display1（）; //调用函数将tome转换为秒

break;

/ * case 3：

time.diffTime（）;

休息;

案例4：

time.substracTime（）; //调用函数从秒中减去时间

break;

case 5：

time.addTime（）; //调用函数从秒中减去时间

break;

* / case 6：cout<<"谢谢你使用过这个系统，Bye Bye！ !!  $

休息;


默认值：cout<<"错误：无效选项，请再试一次 ;

}

} while（选择！= 6）;


} //结束功能菜单

int main（）

{

timeChange time;

menu（）;

getch（） ;

返回0;

}

解决方案

"肯" <乐****** @ yah00.c0m>在留言中写道

新闻：wj ************** @ news20.bellglobal.com ...

我有一个小程序，wi tha菜单（目前只有选项1,2和6正在工作）
发生了一些奇怪的事情，我的数组工作输入
用户输入的所有数据，但是我是选择选项2，显示，它总是给我4202717
数组中的元素编号1，而0,2,3 ..都没关系。
它似乎是跳过数组中的数字1 。
任何人？
问题在于createTime（）函数

我正在使用visual c ++
ken

#include< iostream>
#include< conio.h>
使用命名空间std;

类timeChange
{
公开：
void createTime（）;
void display1（）;

private：
int t1，t2，i，j，a [];


a []不是合法的C ++。我不知道visual c ++是什么造成的，但它并不是正确的。如果你想用C ++声明一个数组，你必须说出你想要多大的数量

。

};

内联void timeChange： ：createTime（）
{

if（t1> 0）


t1此时未实现

{
cout<<<"输入数字1： << endl;
cin>> t2;
i = 0;
i = i + j;


j此时尚未初始化

do {
cout<<"在j之前： << j<< endl;
cout<<" a [i]： << a [i]<< endl;
cout<<" t2： << t2<< endl;
cout<<"在我之前： << i<< endl;
i ++;
a [i] = t2;
j = i;
cout<<" j： << j<< endl;
cout<<" a [i]： << a [i]<< endl;
cout<<" t2： << t2<< endl;
cout<<"我： <<我<< endl;
}
而（t1< 0）;

}


{
cout<<"输入数字2： << endl;
cin>> t1;
i = 0;
做{
a [i] = t1;
cout<<<"在j之前： << j<< endl;
cout<<" t1： << t1<< endl;
cout<<"我： <<我<< endl;
cout<<" a [i]： << a [i]<< endl;
cout<<"在i ++之前： << i<< endl;
i ++;
j = i;

cout<<" j： << j<< endl;
cout<<" t1： << t1<< endl;
cout<<"我： << i<< endl;
}
while（t1< 0）;

} //结束其他

} //结束无效函数

在给出值之前你不应该使用变量。


john

Ken schrieb：

问题在于createTime（）函数

[...]

类timeChange
{
公开：
void createTime（）;
void display1（）;

私人：
int t1，t2，i， j，a [];
};

内联void timeChange :: createTime（）

if（t1> 0）

首先，你应该在使用它们之前初始化类的变量。

写一个构造函数并将t1，t2，i，j设置为零或者你喜欢什么。

如果你不这样做，变量包含随机和随机。数字。


其次，" int a []"没什么。它是一个int数组的声明，其元素为零

。当你访问索引时，它不会自动增长

绑定。


也许你应该读一本关于C ++编程或搜索网络的好书

的在线教程。


-

Thomas

http://www.draig.de/LinkBar/

此时t1是未初始化的

{
cout<<"输入数字1： << endl;
cin>> t2;
i = 0;
i = i + j;


j此时尚未初始化

这些已经在课程的私人部分初始化。

其次，如果我给它们是函数开头的一个值，怎么可以增加工作？

ken


" John哈里森" <乔************* @ hotmail.com>在消息中写道

news：2h ************ @ uni-berlin.de ...
Ken <乐****** @ yah00.c0m>在消息中写道
新闻：wj ************** @ news20.bellglobal.com ...

我有一个小程序，wi tha menu （只有选项1,2和6现在是
工作）
发生了一些奇怪的事情，我的数组工作输入用户

输入的所有数据，但是我是选择选项2，显示，它总是给我
4202717为数组中的元素编号1，而0,2,3 ..都没问题。
它似乎跳过数组中的数字1 。
任何人？
问题在于createTime（）函数

我正在使用visual c ++
ken

#include< iostream>
#include< conio.h>
使用命名空间std;

类timeChange
{
公开：
void createTime（）;
void display1（）;

私人：
int t1，t2，i，j，a [];

]不是合法的C ++。我不知道visual c ++是什么造成的，但它

是不对的。如果你想用C ++声明一个数组，你必须说出b $ b想要它有多大。

};

内联void timeChange： ：createTime（）
{

if（t1> 0）

此时t1是未初始化的

{
cout<<"输入数字1： << endl;
cin>> t2;
i = 0;
i = i + j;

此时j未初始化

做{
cout<<<"在j之前： << j<< endl;
cout<<" a [i]： << a [i]<< endl;
cout<<" t2： << t2<< endl;
cout<<"在我之前： << i<< endl;
i ++;
a [i] = t2;
j = i;
cout<<" j： << j<< endl;
cout<<" a [i]： << a [i]<< endl;
cout<<" t2： << t2<< endl;
cout<<"我： <<我<< endl;
}
而（t1< 0）;

}


{
cout<<"输入数字2： << endl;
cin>> t1;
i = 0;
做{
a [i] = t1;
cout<<<"在j之前： << j<< endl;
cout<<" t1： << t1<< endl;
cout<<"我： <<我<< endl;
cout<<" a [i]： << a [i]<< endl;
cout<<"在i ++之前： << i<< endl;
i ++;
j = i;

cout<<" j： << j<< endl;
cout<<" t1： << t1<< endl;
cout<<"我： << i<< endl;
}
while（t1< 0）;

} //结束其他

} //结束无效函数

在给出值之前你不应该使用变量。

john

I have a small program , wi tha menu (only option 1,2 and 6 are working
for now)
Something weird is happening, my array works to input all the data the user
puts in, but whebn I choose option 2, display, it always gives me 4202717
for the element number 1 in the array, While 0,2,3 .. are all ok.
It seems to be skipping number 1 in the array.
anyone ?
problem is in createTime() function

I am using visual c++
ken
#include <iostream>
#include <conio.h>
using namespace std;

class timeChange
{
public:
void createTime();
void display1();

private:
int t1, t2, i, j, a[] ;
};

inline void timeChange::createTime()
{

if (t1 >0)
{
cout<<" Enter a number 1: " <<endl;
cin>> t2;
i=0;
i = i + j;
do {
cout<<" before j: " << j <<endl;
cout<<" a[i]: " << a[i] <<endl;
cout<<" t2: " << t2 <<endl;
cout<<" before i: " << i <<endl;
i++;
a[i] = t2;
j = i;
cout<<" j: " << j <<endl;
cout<<" a[i]: " << a[i] <<endl;
cout<<" t2: " << t2 <<endl;
cout<<" i: " << i <<endl;
}
while (t1 < 0);

}

else
{
cout<<" Enter a number 2: " <<endl;
cin>> t1;
i =0;
do {
a[i] = t1;
cout<<" before j: " << j <<endl;
cout<<" t1: " << t1 <<endl;
cout<<" i: " << i <<endl;
cout<<" a[i]: " << a[i] <<endl;
cout<<" before i++: " << i <<endl;
i++;
j = i;

cout<<" j: " << j <<endl;
cout<<" t1: " << t1 <<endl;
cout<<" i: " << i <<endl;
}
while (t1 < 0);
} // end else

} //end void function
inline void timeChange::display1()
{

cout<<" Here it is: " << t1 <<endl;
for (int i=0; i<= j; i++)

{
cout<<"a[i]: " << a[i] << endl;
cout<<"i: " << i << endl;
}

}

/*inline void timeChange::diffTime()
inline void timeChange::substracTime()
inline void timeChange::addTime()
inline void timeChange::validateTime()
*/
void menu() //showing the menu for the 4 options
{ timeChange time;
int choice;

do {
cout << endl << endl;
cout << " Time Management System "<<endl;
cout << "============================================= = "<<endl;
cout << " 1: Create a new time object "<<endl;
cout << " 2: Display all time object "<<endl;
cout << " 3: Calculate the difference between two times "<<endl;
cout << " 4: Substrat a number of seconds from a time "<<endl;
cout << " 5: Add a number of seconds to a time "<<endl;
cout << " 6: Quit "<<endl;
cout << "============================================= = "<<endl;

cout << " Your choice please: ";
cin >> choice;

switch (choice)
{
case 1:
time.createTime();
//Calling function to convert seconds into hours
break;
case 2:
time.display1(); //Calling function to convert tome to seconds
break;
/* case 3:
time.diffTime();
break;
case 4:
time.substracTime(); //Calling function to subtract a time from seconds
break;
case 5:
time.addTime(); //Calling function to subtract a time from seconds
break;
*/ case 6: cout<<"Thank you for having used this system, Bye Bye!!!";
break;

default: cout<<"Error: Invalid option, Please try again" ;
}
} while (choice != 6);

}// end function menu
int main()
{
timeChange time;
menu();
getch();
return 0;
}

解决方案

"Ken" <le******@yah00.c0m> wrote in message
news:wj**************@news20.bellglobal.com...

I have a small program , wi tha menu (only option 1,2 and 6 are working
for now)
Something weird is happening, my array works to input all the data the user puts in, but whebn I choose option 2, display, it always gives me 4202717
for the element number 1 in the array, While 0,2,3 .. are all ok.
It seems to be skipping number 1 in the array.
anyone ?
problem is in createTime() function

I am using visual c++
ken
#include <iostream>
#include <conio.h>
using namespace std;

class timeChange
{
public:
void createTime();
void display1();

private:
int t1, t2, i, j, a[] ;
a[] is not legal C++. I''ve no idea what visual c++ makes of it, but it isn''t
right. If you want to declare an array in C++ you must say how big you want
it to be.
};

inline void timeChange::createTime()
{

if (t1 >0)
t1 is unintialised at this point
{
cout<<" Enter a number 1: " <<endl;
cin>> t2;
i=0;
i = i + j;
j is uninitialised at this point
do {
cout<<" before j: " << j <<endl;
cout<<" a[i]: " << a[i] <<endl;
cout<<" t2: " << t2 <<endl;
cout<<" before i: " << i <<endl;
i++;
a[i] = t2;
j = i;
cout<<" j: " << j <<endl;
cout<<" a[i]: " << a[i] <<endl;
cout<<" t2: " << t2 <<endl;
cout<<" i: " << i <<endl;
}
while (t1 < 0);

}

else
{
cout<<" Enter a number 2: " <<endl;
cin>> t1;
i =0;
do {
a[i] = t1;
cout<<" before j: " << j <<endl;
cout<<" t1: " << t1 <<endl;
cout<<" i: " << i <<endl;
cout<<" a[i]: " << a[i] <<endl;
cout<<" before i++: " << i <<endl;
i++;
j = i;

cout<<" j: " << j <<endl;
cout<<" t1: " << t1 <<endl;
cout<<" i: " << i <<endl;
}
while (t1 < 0);
} // end else

} //end void function

You shouldn''t use variables before you have given them values.

john

Ken schrieb:

problem is in createTime() function

[...]

class timeChange
{
public:
void createTime();
void display1();

private:
int t1, t2, i, j, a[] ;
};

inline void timeChange::createTime()
{

if (t1 >0)

First, you should initialize the variables of the class before using them.
Write a constructor and set t1,t2,i,j to zero or whatever you like.
If you don''t do so, the variables contain "random" numbers.

Second, "int a[]" is nothing. It is a declaration of an int-array with zero
elements. It does not grow automaticaly when you access an index that is out
of bound.

Maybe you should read a good book about C++ programming or search the web
for an online tutorial.

--
Thomas

http://www.draig.de/LinkBar/

t1 is unintialised at this point

{
cout<<" Enter a number 1: " <<endl;
cin>> t2;
i=0;
i = i + j;
j is uninitialised at this point
THOSE HAS BEEN initialized in the private part of the class.
Second, if I give them a value at the beginning of the function, how can
my incrementation work ???
ken

"John Harrison" <jo*************@hotmail.com> wrote in message
news:2h************@uni-berlin.de...
"Ken" <le******@yah00.c0m> wrote in message
news:wj**************@news20.bellglobal.com...

I have a small program , wi tha menu (only option 1,2 and 6 are working for now)
Something weird is happening, my array works to input all the data the user

puts in, but whebn I choose option 2, display, it always gives me 4202717 for the element number 1 in the array, While 0,2,3 .. are all ok.
It seems to be skipping number 1 in the array.
anyone ?
problem is in createTime() function

I am using visual c++
ken
#include <iostream>
#include <conio.h>
using namespace std;

class timeChange
{
public:
void createTime();
void display1();

private:
int t1, t2, i, j, a[] ;

a[] is not legal C++. I''ve no idea what visual c++ makes of it, but it

isn''t right. If you want to declare an array in C++ you must say how big you want it to be.

};

inline void timeChange::createTime()
{

if (t1 >0)

t1 is unintialised at this point

{
cout<<" Enter a number 1: " <<endl;
cin>> t2;
i=0;
i = i + j;

j is uninitialised at this point

do {
cout<<" before j: " << j <<endl;
cout<<" a[i]: " << a[i] <<endl;
cout<<" t2: " << t2 <<endl;
cout<<" before i: " << i <<endl;
i++;
a[i] = t2;
j = i;
cout<<" j: " << j <<endl;
cout<<" a[i]: " << a[i] <<endl;
cout<<" t2: " << t2 <<endl;
cout<<" i: " << i <<endl;
}
while (t1 < 0);

}

else
{
cout<<" Enter a number 2: " <<endl;
cin>> t1;
i =0;
do {
a[i] = t1;
cout<<" before j: " << j <<endl;
cout<<" t1: " << t1 <<endl;
cout<<" i: " << i <<endl;
cout<<" a[i]: " << a[i] <<endl;
cout<<" before i++: " << i <<endl;
i++;
j = i;

cout<<" j: " << j <<endl;
cout<<" t1: " << t1 <<endl;
cout<<" i: " << i <<endl;
}
while (t1 < 0);
} // end else

} //end void function

You shouldn''t use variables before you have given them values.

john

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