array of char in C code example

Example 1: string in c

#include <stdio.h>
void displayString(char str[]);

int main()
{
    char str[50];
    printf("Enter string: ");
    fgets(str, sizeof(str), stdin);             
    displayString(str);     // Passing string to a function.    
    return 0;
}
void displayString(char str[])
{
    printf("String Output: ");
    puts(str);
}

Example 2: return char array in c

char * createStr() {

    char char1= 'm';
    char char2= 'y';

    char *str = malloc(3);
    str[0] = char1;
    str[1] = char2;
    str[2] = '\0';

    return str;

}

Example 3: string in c

#include <stdio.h>

int main() {
  char *str1 = strdup("Hello");
  char *str2 = malloc(sizeof(char) * (strlen(str1) + 1));
  
  for (int i = 0; i < strlen(str1); ++i)
    str2[i] = str1[i];
  str2[strlen(str1)] = '\0'; // very important, the string stop to print
  printf("%s --> %s\n", str1, str2);
}

Example 4: how to feed a char array to function in C

//If you know the size of the array you can pass it like this
void function(char array[10]) {
	//Do something with the array...
}

int main() {
	char array[] = {'a', 'b', ..., 'j'};
    function(array);
}