计算器程序，无法正确输出最后的结果！ - 编程论坛

#2

maoguoqing2007-03-07 23:07

if (op != 65 && op !=83 && op != 77 && op != 68)
如果还是不行的话你在 cin >> op;之前加个 cin.ignore();试试

#3

含笑半步颠2007-03-08 10:07

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显示是这样我照你给的方法改过来了

#4

虫虫飞ya飞2007-03-08 10:17

首先你程序的op那是字符型的你做if判断不能按你的意思正确判断,把op改成int型.另外你是不是没看程序只是复制粘贴的,你输入23,和输入123后下面是正确的输出啊你程序就是这么设定的,你想输出计算结果后面还要继续输入op的值才能判断你要用哪个输入符.
#include <iostream.h>
void main()
{
float num1;
float num2;
int op;
float ans;
cout << "Please enter a number: " ;
cin >> num1;
cout << "please entet another nunber: " ;
cin >> num2;
cout << "press A to add the two numbers."
<< endl
<< "press S to subtract the two numbers."
<< endl
<< "press M to multiply the two numbers."
<< endl
<< "press D to divide the two numbers."
<< endl;
cin >> op;
if (op == 65)
{
ans = num1 + num2;
cout << "The answet is " << ans << endl;
}
if (op == 83)
{
ans = num1 - num2;
cout << "The answet is " << ans << endl;
}
if (op == 77)
{
ans = num1 * num2;
cout << "The answet is " << ans << endl;
}
if (op == 68)
{
ans = num1 / num2;
cout << "The answet is: " << ans << endl;
}
if (op != 65 && op !=83 && op != 77 && op != 68)
{
cout << "No valid operation was chosen!" << endl;
}
}

[此贴子已经被作者于2007-3-8 10:22:16编辑过]

#5

含笑半步颠2007-03-08 20:56

哦哦~
知道了~ 待研究研究！

#6

nuciewth2007-03-08 21:50

接收换行符,使得不会赋值给op

#7

summerwxf2007-03-08 23:14

嘿嘿

#8

i73662007-03-09 12:50

回复：（含笑半步颠）计算器程序，无法正确输出最后的...

// c++ code template
#include <iostream.h>
void main()
{
float num1;
float num2;
char op;
float ans;
cout << "press A to add the two numbers."
<< endl
<< "press S to subtract the two numbers."
<< endl
<< "press M to multiply the two numbers."
<< endl
<< "press D to divide the two numbers."
<< endl;
// cin.ignore();注意这里,如果保留将会有一个输入被忽略,不会的正确的结果.

cout << "Please enter a number: " ;
cin >> num1;
cout << "please entet another nunber: " ;
cin >> num2;
cin >> op;
if (op == 65+32)
{
ans = num1 + num2;
cout << "The answet is " << ans << endl;
}
if (op == 83+32)
{
ans = num1 - num2;
cout << "The answet is " << ans << endl;
}
if (op == 77+32)
{
ans = num1 * num2;
cout << "The answet is " << ans << endl;
}
if (op == 68+32)
{
ans = num1 / num2;
cout << "The answet is: " << ans << endl;
}
if (op != 65 && op !=83 && op != 77 && op != 68)
{
cout << "No valid operation was chosen!" << endl;
}
}
另外,要注意ASCII吗,我觉得应该用小写的,这更符合习惯.

#9

落枫0433352007-03-09 23:45

回复：（含笑半步颠）计算器程序，无法正确输出最后的...

我用你贴得代码在我机器上运行很好啊！！没有什么问题。。。我用的是VC6.0

#10

lehmann2007-03-11 19:08

VC6.0 没问题

#11

冰天雪2007-03-11 19:43

这个是不是编译器的问题啊？

#12

含笑半步颠2007-03-11 21:05

不知道啦~ 我也是用VC6.0
老是没结果

#13

woailiwei2007-03-13 10:10

可以运行VC6.0