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书中页数:P6
代码名称:add.cc
#include <iostream>
int main()
{
// prompt user to enter two numbers
std::cout << "Enter two numbers:" << std::endl;
int v1 = 0, v2 = 0;
std::cin >> v1 >> v2;
std::cout << "The sum of " << v1 << " and " << v2
<< " is " << v1 + v2 << std::endl;
return 0;
}