QBasic/Basic Input

The INPUT command is used to gather input from the user. This section will attempt to teach you how to gather input upon request from the user. For real-time input, see QBasic/Advanced Input.

Here is the syntax of the input command: or

Example:

or

When a semicolon is used after the text output to the user, a question mark (?) and space  are added to the output. When a comma is used, no question mark is added.

If a string is specified (e.g., 'name$'), anything the user enters before pressing the 'return' key will be accepted.

If a numeric variable (e.g., 'age') is specified, the user must enter a number. If any non-numeric key is entered, the error message "Redo from start" will be output and the INPUT command rerun.

6INPUT.BAS
Please note: In the PRINT command, the function concatenates (joins) the contents of the string variables with the text between the quotes (" "). Note the use of spaces so that the final printed text reads properly.

If a numerical variable is specified within the PRINT command, additional space is automatically added both before and after the number.

See also:  command to read a line of text from a file (and place the result in a string variable) or to input a series of variables (in which case any comma found will be treated as a delimiter between fields).

INPUT # and LINE INPUT
INPUT # uses an open file stream to collect data from the file itself. The file may be a data file, a bitmap, or a text file. The syntax is:

LINE INPUT is used to collect an entire line of a text file. Syntax:

WARNING: If input is taken beyond the file end, the error : "Input past end of file " is issued. You can use  and   functions to prevent errors. (LOF stands for LENGTH OF FILE while EOF stands for END OF FILE)