Web Reference: Input validation makes sure the input is correct before the program continues. Without validation, your program might crash or give the wrong result! The examples below show simple ways to check if the user's input is valid in C. Check if the number is within an allowed range (for example, 1 to 5): Check that a name is not empty. Jul 23, 2025 · One of the most common forms of input validation is to ensure that the type of data provided by the user is valid or not. The std::cin object can be used to check the data type of the input. In this example, we prompt the user to enter a positive integer. If the user enters a negative number or zero, we keep prompting until they enter a valid positive integer.
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