C++STL中algorithm里count()函数
C++中algorithm里count()函数
函数原型及描述
作者：小李，不讲道理
count()，存在于vector和string中，分别对单个数字和单个字符计数
string mainString = "Let life be beautiful like summer flowers,death like autumn leaves";
int total = count(mainString.begin(), mainString.end(), 'u');
cout << "this char total is " << total << endl;
输出：this char total is 5
vector countArray = { 1, 3, 2, 3, 4 ,3 ,2, 2, 2 };
int toalNum = count(countArray.begin(), countArray.end(), 2);
cout << "toal: " << toalNum << endl;
输出：total 4
注意
在begin()和end()后面增加增量即指定序列任意区间，如下
int toalNum = count(countArray.begin() + 2, countArray.end() - 2, 2);
作者：小李，不讲道理
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