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直接添加一行代码：

cin >> noskipws;

noskipws




实例：

#include<iostream>

using namespace std;

int main()
{
	cin >> noskipws;//设置cin读取空白符；
	char c;
	size_t acount =0, ecount =0, icount =0, ocount =0, ucount = 0,scount = 0;
	while (cin >> c)
	{
		if (c == 'a')++acount;
		if (c == 'e')++ecount;
		if (c == 'i')++icount;
		if (c == 'o')++ocount;
		if (c == 'u')++ucount;
		if (c == ' ')++scount;

	}

	cout << "a: " << acount << endl;
	cout << "e: " << ecount << endl;
	cout << "i: " << icount << endl;
	cout << "o: " << ocount << endl;
	cout << "u: " << ucount << endl;
	cout << "space: " << scount << endl;


	return 0;
}

***运行结果：***