Passing arrays to functions in C

The following is an example of how to pass a CHAR array to a function in C

In this example, we are simply counting the number of letters in a char array;


int getNumberOfLetters(char w[])
{
     int l=0;
        while (w[l]!='\0')
        {
            l++;
        }
        return l;    
}


char word[100]; // initialise a char array with 100 cells

scanf("%s",word); // Get a word as input

int length = getNumberOfLetters(word); // call our function

Another Example, this time printing out the passed string;

#include <stdio.h>

void my_function(char * str)
{
    printf("%s\n",str);
}

int main()
{
    char name[]="Harold Hellman";
    my_function(name);

    return 0;
}

We can create a function that takes an array of chars as follows;

void myFunction (char* arg)

OR

void myFunction (char arg[])

and similarly, we can call either of the above with;

char myArray[10]="Harry";

myFunction(myArray);