string, file, saving a string into a file. SPACE's won't be saved.

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C++

Visual-Studio

Hi,
I have the code below:

string str1;
	ofstream fp("file1.txt");
	if(fp.is_open()){
		cout<<"\n Enter first string ::: ";
		cin>>str1;
		fp<<str1<<"\n";		
	}	

It works but it doesn't save tho whole string which i type as the input.
for example, i type:

Hello world!

in the file it's written:

Hello

until the first blank space in the sentence it save to a file, after that, i don't know what happens, it just don't save them.

Why does it work like it?
Is it a problem with the string or with the ' fp<< ' ?

How should i fix it?

Thanks,