String Subscript Out of Range (Line 1662).

[Doggie]

Solved

[MiiNiPaa]

length = user_input.length(); Will save lenght of entire "Hello Everyone"
istringstream(user_input) >> inputString; Will read only "Hello"
So you have 5 characters string which you think is 19 characters long. Do not store length, Do not believe what other functions returns. Calculate it in place

[Doggie]

It works! didn't realize that I won't need to use istringstream in the function. Thanks a lot MiiNiPaa!