Small Problem with a getline statement

[FreeThinker]

I seem to be having a problem on a snippet of code in my program.

In this portion of the program I am looking to display the numbers of vowels from an entered string.

I am utilizing a getline for an entered string to accept spaces. However, whenever I would run the program the following is displayed:

Need a message: Message:
Number of Vowels: 0


Here is my code.

int choice1(){
	
	string str; 
	int v = 0; 
	
	cout<<"Need a Message: ";
	getline(cin, str);
	
	for (int i = 0; str[i] != '\0'; ++i)
	{
	if (str[i] == 'a' || str[i] == 'e' || str[i] == 'i' || str[i] == 'o' || str[i] == 'u' || str[i] == 'A' || str[i] == 'E' || str[i] == 'I' || str[i] == 'O' || str[i] == 'U') ++v;
	}
	
	cout <<" Message: "<< str << endl;
	cout <<"Number of Vowels: "<< v <<endl;
}

Some help would be appreciated.

[salem c]

It looks like you've some previous input using say cin >> var
Which has left a stray \n on the input stream.

So all your str contains here is a newline.

Look up cin.ignore().

[FreeThinker]

When I would use cin.ignore, the code loops infinitely.

[Cheddar99]

I think you'll find this works:

#include <iostream>
#include <string>

int main(){
	
	std::string str; 
	int v = 0; 
	
	std::cout<<"Need a Message: ";
	std::getline(std::cin, str);
	
	for (int i=0; i<=str.length(); ++i)
	{
	if (tolower(str[i]) == 'a' || tolower(str[i]) == 'e' || tolower(str[i]) == 'i' ||
            tolower(str[i]) == 'o' || tolower(str[i]) == 'u') ++v;
	}
	
	std::cout << "Message: "<< str << std::endl;
	std::cout << "Number of Vowels: "<< v << std::endl;
}

Sample Output:

Need a Message: This IS a Test
Message: This IS a Test
Number of Vowels: 4

Hope that helps.