strcmp on a line read with fgets

by

strcmp is one of the few functions that has the reverse results of true and false…if the strings are equal, the result is 0, not 1 as you would think….

if (strcmp(a, b)) {
    /* Do something here as the strings are not equal */
} else {
    /* Strings are equal */
}

Speaking of fgets, there is a likelihood that there is a newline attached to the end of the string…you need to get rid of it…

+-+-+-+--+--+
|b|o|b|\n|\0|
+-+-+-+--+--+

To get rid of the newline do this.
CAVEATS: Do not use “strlen(aName) – 1”, because a line returned by fgets may start with the NUL character – thus the index into the buffer becomes -1:

aName[strcspn(aName, "\n")] = '\0';

+-+-+-+--+
|b|o|b|\0|
+-+-+-+--+

Now, strcmp should return 0…

More Related Contents:

  1. Removing trailing newline character from fgets() input
  2. How do I properly compare strings in C?
  3. Reading string from input with space character? [duplicate]
  4. fgets() includes the newline at the end [duplicate]
  5. What does strcmp() exactly return in C?
  6. strstr not functioning
  7. String termination C/C++ char = 0
  8. ‘ ‘, ‘\n’ , scanf() and output screen
  9. How do I concatenate const/literal strings in C?
  10. How to convert a string to integer in C?
  11. How do I trim leading/trailing whitespace in a standard way?
  12. Using the equality operator == to compare two strings for equality in C [duplicate]
  13. How to convert integer to string in C? [duplicate]
  14. How can I compare strings in C using a `switch` statement?
  15. Why does strcmp() return 0 when its inputs are equal?
  16. C – Difference between “char var[]” and “char *var”?
  17. Why does strchr take an int for the char to be found?
  18. Append Char To String in C?
  19. How to extract numbers from string in c?
  20. How to check if a string is a number?
  21. How to format strings using printf() to get equal length in the output
  22. Literal string initializer for a character array
  23. Issue with cin when spaces are inputted, using string class
  24. Why is the gets function so dangerous that it should not be used?
  25. How does strcmp() work?
  26. Why do strings in C need to be null terminated?
  27. whitespace in the format string (scanf)
  28. Why do i have to input EOF 3 times when using fgets?
  29. How to fgets() a specific line from a file in C?
  30. Assign string to element in structure in C

Leave a Comment