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How to find the length of a string using strlen in C

cooldashing24 profile image Vishnu Damwala Originally published at meshworld.in ใƒป1 min read

A tutorial for finding the length of a string using strlen in C - language

  • The strlen() function counts the number of characters in a given string and returns the long unsigned integer value.
  • It is defined in C standard library, within <string.h> header file.
char saying[] = "Better late than never";
strlen(saying);
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  • It stops counting when the null character is encounter. Because in C, null character is considered as the end of the string.

Working example

#include <string.h>
#include <stdio.h>

int main()
{
    char planet[] = "Earth";

    printf("\n Using strlen for planet without null character: %zu", strlen(planet));
    printf("\n Using sizeof for planet with null character: %zu", sizeof(planet));

    return 0;
}
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Output

Using strlen for planet without null character: 5
Using sizeof for planet with null character: 6
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Note that the strlen() function doesn't count for the null character \0 whereas sizeof() function does.

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