#include<iostream.h>
int main()
{
int n1,n2,sum;
cout << "enter the first interger\n";
cin>>n1;
cout<<"enter the second interger\n";
cin>>n2;
sum=n1+n2;
cout<<"sum is "<<sum<<endl;
return 0;
}
//如果是输入字母为什么不能输入第二个数，而且会出现"sum is -858993460"?
我是新人，还请多多提携，不吝赐教

#include<iostream.h>
int main()
{
char n1,n2,sum;
cout << "enter the first interger\n";
cin>>n1;
cout<<"enter the second interger\n";
cin>>n2;
sum=n1+n2;
cout<<"sum is "<<sum<<endl;
return 0;
}
如果我改成字符类型又输入字符，就会输出"sum is ?"
这又为什么呢？

我知道了，因为我输入的是"a"和"b"，因为ASC2码的“？”是195号，所以才是“？”