You don’t always want to only get lines, and sometimes you want to get a single character but whitespace characters should be included. In these cases, the easiest way to read a single character is using one of the built in functions of the cinobject called indie icons for apps get(). The get() member function will read a single character, including whitespace. The following program from the textbook (Program 3-21) demonstrates three ways to use the get()member function in a program that simply waits for the user to press any key.
NCount – The maximum number of characters to extract. The braces enclosing the body of a function should be aligned with the function name. Although it will not generate any error, but it makes our code more readable. Int num; – This declares that variable num is an integer.
Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. “Finding the smallest program that demonstrates the error” is a powerful debugging tool.
We will not modify original string instead we will create a new string having all characters of input string except spaces. So why not put the cin.ignore() before calls to getline? Well, because you’d have problems if you had two calls to getline back to back. That’s because the getline function automatically removes the newline from the buffer. So if you called ignore() before getline, but the previous read from the buffer also used getline, then the newline wouldn’t be there and you’d be ignoring real data.
Thus in our calculator program, the output prompts still print, but any requests for further extraction are ignored. After asking the user to enter another double value, the “7” in the buffer gets extracted without asking the user. Since the user never had an opportunity to enter additional data and hit enter , the output prompts all run together on the same line. The process of checking whether user input conforms to what the program is expecting is called input validation.