统计元音字母

//统计元音字母——输入一个字符串，统计处其中元音字母的数量。更复杂点的话统计出每个元音字母的数量。
#include <iostream>
using namespace std;

bool CountChar(const char* str, int* cA, int* cE, int* cI, int* cO, int* cU, int* all)
{
	int len = strlen(str);
	if (cA == NULL ||
		cE == NULL ||
		cI == NULL ||
		cO == NULL ||
		cU == NULL)
		return false;
	*cA = *cE = *cI = *cO = *cU = *all = 0;

	for (int i = 0; i < len; ++i)
	{
		switch (str[i])
		{
		case "a":
		case "A":
			(*cA)++;
			break;
		case "e":
		case "E":
			(*cE)++;
			break;
		case "o":
		case "O":
			(*cO)++;
			break;
		case "i":
		case "I":
			(*cI)++;
			break;
		case "U":
		case "u":
			(*cU)++;
			break;
		default:
			break;
		}
	}
	*all = *cA + *cE + *cI + *cO + *cU;
	return true;
}

int main(int argc, char* argv[])
{
    char* str = "hello, pretty girls !";
    int cA, cE, cI, cO, cU, all;
    if (CountChar(str, &cA, &cE, &cI, &cO, &cU, &all))
        cout << "cA:" << cA << endl
             << "cE:" << cE << endl
             << "cI:" << cI << endl
             << "cO:" << cI << endl
             << "cU:" << cU << endl
             << "all:" << all << endl;

    system("pause");
    return 0;
}