Finding the length of a Character Array in C

Question

What is a way in C that someone could find the length of a Character array    I will happily accept psuedo-code  but am not averse to someone writing it out if they d like to

User · Answer

If you have an array  then you can find the number of elements in the array by dividing the size of the array in bytes by the size of each element in bytes   char x 10   int elements in x   sizeof x    sizeof x 0      For the specific case of char  since sizeof char     1  sizeof x  will yield the same result   If you only have a pointer to an array  then there s no way to find the number of elements in the pointed-to array   You have to keep track of that yourself   For example  given   char x 10   char  pointer to x   x    there is no way to tell from just pointer to x that it points to an array of 10 elements   You have to keep track of that information yourself   There are numerous ways to do that   you can either store the number of elements in a variable or you can encode the contents of the array such that you can get its size somehow by analyzing its contents  this is effectively what null-terminated strings do   they place a   0  character at the end of the string so that you know when the string ends

User · Answer

using sizeof     char h      hello   printf   d n  sizeof h -1     Output   5      using string h    include  lt string h gt   char h      hello   printf   d n  strlen h      Output   5      using function  strlen implementation    int strsize const char  str   int main        char h      hello       printf   d n  strsize h      Output   5     return 0    int strsize const char  str       return   str    strsize   str    1   0

User · Answer

You can use this function   int arraySize char array          int cont   0      for  int i   0  array i     0  i                cont        return cont

User · Answer

You can use strlen  strlen urarray     You can code it yourself so you understand how it works  size t my strlen const char  str      size t i     for  i   0  str i   i       return i      if you want the size of the array then you use sizeof  char urarray 255   printf   zu   sizeof urarray

User · Answer

Provided the char array is null terminated  char chararray 10      0    size t len   strlen chararray

User · Answer

Although the earlier answers are OK  here s my contribution    returns the size of a character array using a pointer to the first element of the character array int size char  ptr          variable used to access the subsequent array elements      int offset   0        variable that counts the number of elements in your array     int count   0         While loop that tests whether the end of the array has been reached     while    ptr   offset       0                   increment the count variable           count            advance to the next element of the array           offset              return the size of the array     return count     In your main function  you call the size function by passing the address of the first element of your array  For example  char myArray       h    e    l    l    o    printf  quot The size of my character array is   d n quot   size  amp myArray 0

User · Answer

If you want the length of the character array use sizeof array  sizeof array 0    if you want the length of the string use strlen array

User · Answer

By saying  Character array  you mean a string  Like  hello  or  hahaha this is a string of characters     Anyway  use strlen    Read a bit about it  there s plenty of info about it  like here

User · Answer

There is also a compact form for that  if you do not want to rely on strlen  Assuming that the character array you are considering is  msg        unsigned int len 0    while   msg len    len

[c] Finding the length of a Character Array in C

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