C String – strcmp() function2 min read

strcmp() function is used to compare two string to each other and returns an integer value.

The strcmp() function is defined in the header file string.h.

It takes two arguments, the name of the first string and the second string. These two strings are compared with each other and the returned integer value depends on following condition.

  • returns 0: if both the string are equal.
  • returns negative integer: if string1 < string2
  • returns positive integer: if string1 > string2

And is written as follows:

strcmp(first_string, second_string);

C Program for strcmp() function


Strings (str1,str2) are not equal.
Retuned Integer value fron str2 and str3 cmp: 0

The program shows the comparison in two different ways, one with help of if..else statement in C and another recognized by the integer value returned by strcmp() function.

C String – strncmp function

It is the same as the above strcmp() function but here the difference is that it takes the third argument for n number of characters to be compared from both the strings.

It is written as follows:

strncmp(first_string, second_string, n);

C Program for strncmp() function


Strings (str1,str2) are equal.

As you can see, the third argument passed is 11 that means the strncmp() functions take 11 characters from both the strings and compare them to each other and check if they are equal or not.

In this case, the result is equal even though both the strings (simple2codeWebsite, simple2code.com) are different but their first 11 characters are equal. Hence the result is equal.


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