A standard C function that returns the length of a string.
This function calculates the length of the string, excluding the terminating null byte \0. It is defined in the <string.h> standard header.
Questions tagged [strlen]
692 questions
3
votes
7 answers
Checking string length, max and minimum
Is there a function to check if a string is too long or too short, I normally end up writing something like this in several places:
if (strlen($input) < 12)
{
echo "Input is too short, minimum is 12 characters (20 max).";
}
elseif(strlen($input)…
john mossel
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3
votes
2 answers
How to use calloc() in C?
Shouldn't I get an error if my string goes over 9 characters long in this program?
// CString.c
// 2.22.11
#include
#include
#include
main()
{
char *aString = calloc(10, sizeof(char));
if (aString == NULL)
…
nambvarun
- 1,201
- 4
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3
votes
3 answers
PHP String Length Without strlen()
Just browsing over the latest release of the PHP coding standards, and something caught my eye:
http://svn.php.net/viewvc/php/php-src/trunk/CODING_STANDARDS?revision=296679&view=markup
Coding standard #4 states that "When writing functions that deal…
Unpossible
- 10,607
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3
votes
1 answer
string.h output words C
I need to compare the first and the last letter in a word; if these letters are the same, I need to output that word to a file.
But I take words from another file. My problem is i can't guess how i should output all words because in my code, it…
Nikita Gusev
- 143
- 10
3
votes
6 answers
C: Custom strlen() library function
I created my version of strlen() function.
unsigned int my_strlen(char *p)
{
unsigned int i = 0;
while(*p!='\0')
{
i++;
p++;
}
return i;
}
It gives me correct output everytime i run.But my collegues are saying…
Cody
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3
votes
3 answers
How is the strlen calculated for a string without null character?
This code returns n=11, with 10th and 11th character as ' ' and '@'
How does this work? How does strlen function take it as 11 characters? It seems like it takes the string length as 12 characters in some compilers.
#include
#include…
PyRookie
- 75
- 2
- 4
3
votes
2 answers
strlen() not working with string variable
#include
#include
#include
using namespace std;
int main()
{
string b="hello";
cout<
Waters Sharma
- 68
- 1
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- 11
3
votes
5 answers
Why is my Content-Length header wrong?
I am trying to find out the exact length of a string using strlen() in php 5.2. The string ($data) contains '\t' and '\n'.
echo strlen($data);
Code:
// fetch table header
$header = '';
while ($fieldData = $result->fetch_field()) {
…
kobra
- 4,853
- 10
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- 33
3
votes
8 answers
Is copying in a loop less efficient than memcpy()?
I started to study IT and I am discussing with a friend right now whether this code is inefficient or not.
// const char *pName
// char *m_pName = nullptr;
for (int i = 0; i < strlen(pName); i++)
m_pName[i] = pName[i];
He is claiming that for…
L. Resnik
- 101
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3
votes
3 answers
Segmentation fault with strlen when not ever using strlen?
I have some code which takes a file, reads each line into a new string array (and adds 128 to each character), then assigns each array into an array of pointers, then prints each array. When trying to run the code I get an error stating a…
Finlandia_C
- 385
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- 19
3
votes
3 answers
strlen returning wrong value
I'm building a text editor using doubly linked lists. These are my structs:
#define N 4
typedef struct node
{
char data[N];
int size;
struct node* next;
struct node* prev;
}node;
typedef struct text
{
struct node* head;
…
user3484582
- 557
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- 22
3
votes
1 answer
warning: incompatible implicit declaration of built-in function 'strlen' and 'strcpy'
I just finnished my hangman game and as a last step I am doing some code cleanup and optimization, but I can't seem to understand why I receive the following two warnings:
warning: incompatible implicit declaration of built-in function…
rampy
- 33
- 1
- 1
- 4
3
votes
3 answers
How to create a new char* in standard C
I have this code made for C++ (it works):
char* ConcatCharToCharArray(char *Str, char Chr)
{
char *StrResult = new char[strlen(Str) + 2];
strcpy(StrResult, Str);
StrResult[strlen(Str)] = Chr;
StrResult[strlen(Str) + 1] = '\0';
…
soulblazer
- 1,178
- 7
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3
votes
1 answer
php strlen shows different length of array elements
I am having a problem. I have a string in a variable. I split the string in to an array using explode function. But strlen function shows different lengths when I echo the string as an array element and echo the same string in strlen function. Below…
Riz
- 185
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3
votes
3 answers
Counting special characters with PHP
I want to count the number of characters in a textfield on my website. The textfield accepts any type of input from a user, including ascii art and other special characters. If the user types in normal characters, I can use strlen($message) to…
user1399181
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