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a++是先把a加一然后再运算
#include<iostream> using namespace std; int main() { int a = 2, b1= 4,b2=4; int sum1,sum2; sum1 = a + (b1++); sum2 = a + (++b2); cout << "sum1=" << sum1 << endl; cout << "sum2=" << sum2 << endl; cout << "b1=" << b1 << endl; cout << "b2=" << b2<< endl; return 0; }
sum1=6;sum2=7;b1=b2=5;说明a++是先计算其它的，最后再把a的数值加一；而++a是先把a的数值加一然后一起计算。（总而言之，从左往右的顺序，遇见++就先把那个数加一，如果先遇到a那么就先计算那个式子）
又列如：
#include<iostream>
using namespace std;
int main()
{
int a=5,a1 = 5, a2 = 5, b1 = 4, b2 = 4, b3 = 4;
int sum1,sum2,sum3,sum4;
sum1 = a > b1++ ? a : b2;
sum2 = a>++ b3 ? a : b2;
sum3 = a2 > b2 ? ++a : b2;
sum4 = a2 > b2 ? a1++ : b2;
cout << "sum1=" << sum1 << endl;
cout << "sum2=" << sum2<< endl;
cout << "sum3=" << sum3 << endl;
cout << "sum4=" << sum4 << endl;
cout << "b1=" << b1 << endl;
cout << "b2=" << b2<< endl;
return 0;
}
有趣的：
#include<iostream> using namespace std; int main() { int a = 5,b=5; int sum; sum = a > b++ ? a : b++; cout << "sum=" << sum << endl; cout << "b=" << b << endl; return 0; }
sum=6,b=7
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原文地址：http://www.cnblogs.com/lancoyun/p/5928841.html
