What to do if there is an error in scanf in C language

In C language, methods for handling scanf function errors include: 1. Check the format string; 2. Check the input; 3. Check the return value; 4. Set the error flag; 5. Use the error handling function; 6. Use custom error handling. To prevent errors, use the correct data types, carefully validate input, check return values, and handle potential errors in your program.

How to handle scanf errors in C language

When using the scanf function to read input in C language , errors may occur. The following are several common error handling methods:

1. Check the format string

Make sure that the format string used in scanf matches the data of the variable to be read type matches. For example, to read a string, the format string should be %s, not %d.

2. Check the input

Ensure that the input content conforms to the format specified in scanf. For example, if the format string is %d, the input should be an integer, not a string.

3. Check the return value

The scanf function returns an integer indicating the number of input variables successfully read. If the return value is not what is expected, an error has occurred.

4. Set the error flag

If scanf detects an error, it sets the errno global variable. The error type can be determined by examining the value of errno.

5. Use error handling functions

The C language library provides several error handling functions, such as perror() and strerror(), which can help with diagnosis and reporting scanf error.

6. Use custom error handling

If the built-in error handling method does not meet the needs, you can implement custom error handling code. For example, you can write a function that prints an error message and terminates the program.

Tip to prevent scanf errors:

• Use the correct data type.
• Verify input carefully.
• Check the return value of scanf.
• Handle potential errors in the program.

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