文件 C++ 中的字符交换
我不知道为什么这不起作用，我需要交换作为 a 和 b 输入的两个字符，它可以编译，但所有字符都被替换为作为 b 输入的字符，有什么建议吗？
while (n != exist)
{
cout<<"What is the letter you want to swap?"<<endl;
cin>>a;
cout<<"What is the letter you want to swap it with?"<<endl;
cin>>b;
if (inFile.is_open())
{
while (inFile.good())
{
inFile.get(c);
if( c = a )
{
outFile<< b;
}
else if (c = b)
{
outFile<< a;
}
else
{
outFile<< c;
}
}
}
else
{
cout<<"Please run the decrypt."<<endl;
}
cout<<"Another letter? <n> to stop swapping"<<endl;
cin>>n;
}
I dont know why this will not work, i need to swap the two chars enterd as a and b, it compiles but all the chars are replaced with the char inputted as b, any advise?
while (n != exist)
{
cout<<"What is the letter you want to swap?"<<endl;
cin>>a;
cout<<"What is the letter you want to swap it with?"<<endl;
cin>>b;
if (inFile.is_open())
{
while (inFile.good())
{
inFile.get(c);
if( c = a )
{
outFile<< b;
}
else if (c = b)
{
outFile<< a;
}
else
{
outFile<< c;
}
}
}
else
{
cout<<"Please run the decrypt."<<endl;
}
cout<<"Another letter? <n> to stop swapping"<<endl;
cin>>n;
}
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评论（4）
在
if和else if中，您需要使用==而不是=。在 C++/C 中，使用==进行比较，使用=进行赋值。In
ifandelse ifyou need to use==instead of=. In C++/C you use==for comparison and=for assignment.=用于赋值，==用于比较。按照你的方式，只要 a 不为 0（整数 0，而不是字符“0”），第一个分支将始终被执行。
=is for assignment, use==for comparison.The way you have it, as long as a is not 0(the integer 0, not the character '0'), that first branch will always be executed.
if( c = a )和else if (c = b)是可疑的。您分别将 a 的值分配给 c，将 b 的值分配给 c。我相信如果赋值操作成功完成（就是这样），该块就会执行。我相信您需要==运算符，而不是=运算符。if( c = a )andelse if (c = b)are suspect. You are assigning the value of a to c and the value of b to c, respectively. I believe if the assignment operation completes successfully (which is it), the block will execute. I believe you want the==operator, instead of the=operator.您正在分配值而不是测试。
应该是
if (c == b)和
if (c == a)You are assigning values instead of testing.
It should be
if (c == b)and
if (c == a)