GeeksforGeeks
geeksforgeeks.org › c language › strlen-function-in-c
strlen() function in c - GeeksforGeeks
May 29, 2023 - The strlen() function in C calculates the length of a given string. The strlen() function is defined in string.h header file.
TutorialsPoint
tutorialspoint.com › c_standard_library › c_function_strlen.htm
C library function - strlen()
The C library strlen() function is used to calculates the length of the string. This function doesn't count the null character '\0'. In this function, we pass the pointer to the first character of the string whose length we want to determine and as
Videos
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C Programming Example: Implementing strlen function | strlen() ...
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C Program - strlen() Function Example - Find the Length of a String ...
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A look inside the C strlen function - YouTube
strlen function in c
03:01
Manually Find The Length Of A String | C Programming Example - YouTube
String Length Function - strlen() | C Programming | Must Watch
Programiz
programiz.com › c-programming › library-function › string.h › strlen
C strlen() - C Standard Library
#include <stdio.h> #include <string.h> int main() { char a[20]="Program"; char b[20]={'P','r','o','g','r','a','m','\0'}; // using the %zu format specifier to print size_t printf("Length of string a = %zu \n",strlen(a)); printf("Length of string b = %zu \n",strlen(b)); return 0; } ... Note that ...
Code Browser
codebrowser.dev › glibc › glibc › string › strlen.c.html
strlen.c source code [glibc/string/strlen.c] - Codebrowser
Source code of glibc/string/strlen.c glibc glibc-2 on KDAB Codebrowser
w3resource
w3resource.com › c-programming-exercises › c-snippets › implementing-custom-strlen-function-in-c.php
C - Implementing a custom strlen() function
Here's an implementation of a custom strlen() function: ... #include <stdio.h> size_t custom_strlen(const char* str) { size_t len = 0; while (*str != '\0') { len++; str++; } return len; } int main() { char str[] = "C Snippets"; size_t len = ...
W3Schools
w3schools.com › c › ref_string_strlen.php
C string strlen() Function
This is smaller than the amount of memory that is reserved for the string, which can be measured using the sizeof operator instead. The strlen() function is defined in the <string.h> header file.
Aticleworld
aticleworld.com › home › strlen function in c/c++ and implement own strlen()
strlen function in C/C++ and implement own strlen() - Aticleworld
April 18, 2022 - strlen function in C computes length of given string. It takes string as an argument and returns its length and doesn’t count null character.
Log2Base2
log2base2.com › c-examples › string › c-program-length-of-string-strlen-function.html
C program to find length of string using strlen function | strlen() c | Incompatible implicit declaration of built-in function strlen
#include<stdio.h> #include<string.h> ... strlen" #include<string.h> · If we want to use strlen function in our source program, we should include string.h library....
Educative
educative.io › answers › how-to-use-the-strlen-function-in-c
How to use the strlen() function in C
Note: strlen() calculates the length of a string up to, but not including, the terminating null character. Return Value: The function returns the length of the string passed to it.
The Open Group
pubs.opengroup.org › onlinepubs › 9799919799 › functions › strlen.html
strlen
This volume of POSIX.1-2024 defers to the ISO C standard. The strlen() function shall compute the number of bytes in the string to which s points, not including the terminating NUL character.
Wikibooks
en.wikibooks.org › wiki › C_Programming › string.h › strlen
C Programming/string.h/strlen - Wikibooks, open books for an open world
#include <stdio.h> #include <string.h> int main() { char *string = "Hello World"; printf("%lu\n", (unsigned long)strlen(string)); return 0; } This program will print the value 11, which is the length of the string "Hello World". Character strings are stored in an array of a data type called char.
Cppreference
en.cppreference.com › w › c › string › byte › strlen.html
strlen, strnlen_s - cppreference.com
June 13, 2024 - They are pure utility functions used to provide limited support for non-null terminated strings. Run this code · #define __STDC_WANT_LIB_EXT1__ 1 #include <stdio.h> #include <string.h> int main(void) { const char str[] = "How many characters does this string contain?"; printf("without null character: %zu\n", strlen(str)); printf("with null character: %zu\n", sizeof str); #ifdef __STDC_LIB_EXT1__ printf("without null character: %zu\n", strnlen_s(str, sizeof str)); #endif } Possible output: without null character: 45 with null character: 46 without null character: 45 ·
OverIQ
overiq.com › c-programming-101 › the-strlen-function-in-c
The strlen() Function in C - C Programming Tutorial - OverIQ.com
This section discusses some commonly used functions provided by string library in C. These functions are declared in the header file string.h, so before using these function you must include string.h in your program. ... Note: For this chapter ignore the keyword const. It will be discussed later. The strlen() accepts an argument of type pointer to char or (char*), so you can either pass a string literal or an array of characters.
Scaler
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C strlen() - Scaler Topics
July 14, 2024 - The strlen() function in C returns the length of the string which is passed as the parameter to the function. The length of the string is returned in integer type excluding the NULL character. In the above code, We created a string named name.
Upgrad
upgrad.com › home › tutorials › software & tech › strlen() in c
How to Use strlen() Function in C Effectively
April 10, 2025 - Get a comprehensive overview of the strlen() function in C. Learn its syntax, best practices, and how to avoid common errors in string length calculations.
Top answer 1 of 10
36
You should be looking in glibc, not GCC -- it seems to be defined in strlen.c -- here's a link to strlen.c for glibc version 2.7... And here is a link to the glibc SVN repository online for strlen.c.
The reason you should be looking at glibc and not gcc is:
The GNU C library is used as the C library in the GNU system and most systems with the Linux kernel.
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15
Here's the bsd implementation
size_t
strlen(const char *str)
{
const char *s;
for (s = str; *s; ++s)
;
return (s - str);
}
Stack Overflow
stackoverflow.com › questions › 70116574 › creating-an-strlen-function-in-c
string - Creating an strlen function in c - Stack Overflow
Sign up to request clarification or add additional context in comments. ... I've just replaced your (3) and (4) with i++ that will increment until termination (\0) and will return (i). #include <stdio.h> #define MAXLENGTH 80 int my_strlen(char* s) { int i=1; char *p = s; while (*p++) i++; return (i); } int main() { char str[MAXLENGTH]; int len; printf("Enter a string:"); gets(str); len = my_strlen(str); printf("The length of the string %s is %d\n", str, len); }
BeginnersBook -
beginnersbook.com › home › c-programming › c strlen() function – c tutorial
C strlen() Function – C tutorial
September 11, 2022 - The function strlen() returns the length (number of characters) of the given string. Function strlen() Declaration size_t strlen(const char *str) str - This is the given string for which we need to compute the length Return value of strlen() This function returns the integer value representing ...
Top answer 1 of 9
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Similar to @DanielKamilKozar's answer, but with a for-loop, you can do this with no for-loop body, and len gets initialized properly in the function:
void my_strlen(const char *str, size_t *len)
{
for (*len = 0; str[*len]; (*len)++);
}
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size_t str_len (const char *str)
{
for (size_t len = 0;;++len) if (str[len]==0) return len;
}
Studytonight
studytonight.com › c › programs › string › gets()-and-strlen()-function
gets() and strlen() function Examples in C | C Programs | Studytonight
Calculate length of the string using strlen() and copy the value returned by it in a variable named length.