C Reference String Operation: strncmp()

The function strncmp() compares one string with another string up-to n characters.


int strncmp( const char * target, const char * source, size_t count);

If the two strings are equal then zero is returned. If the target string is less than source then a value that is less then zero is returned.
If the target string is greater than source then a value that is greater then zero is returned.

strncmp() source code example:

		char line[100];
		char line2[100];

		printf("Input first word:");
		scanf("%s", line);

		printf("Input second word:");
		scanf("%s", line2);

		if (strncmp(line, line2, 2) == 0)
			printf ("equal\n");

		if (strncmp(line, line2, 2) < 0)
			printf("less then equal\n");

		if (strncmp(line, line2, 2) > 0)\
			printf("greater then equal\n");

Output of the strncmp example:

	Input first word:aabb
	Input second word:aabb

	Input first word:aaaa
	Input second word:aabb

Note: the count is set to 2 in this example.

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There are currently 2 responses to “C Reference String Operation: strncmp()”

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  1. Puddin Tame on September 24th, 2009:

    Title says strncmp, but discussion and code are for strncat.

  2. admin on September 25th, 2009:

    Sorry about that. I think something went wrong during conversion to wordpress. Fixed the problem.

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