输入一串字符, 统计特定字符个数

include < stdio.h >

include < iostream >

include < string >

int main(int argc, char **argv)

{

       
int a = 0, b = 0, c = 0;

       
string str;

       
getline(cin, str);

       
for(auto it = str.begin(); it != str.end(); ++it){

               
if (*it == 'a')a++;

               
else if (*it == 'b')b++;

               
else if (*it == 'c')c++;

       
}

       
printf ("There are %d a, %d b and %d c\n", a, b, c);

    return
0;

}