text: #include <stdio.h>
  #define MAX_STRING 20
  
  int StringLength(char string[]);
  
  int main()
  {
      char input[MAX_STRING]; // Input string
      int length = 0;
  
      printf("Input a word (less than 20 characters!): ");
      scanf("%s", input);
  
      length = StringLength(input);
      printf("The word contains %d characters\n", length);
  }
  
  int StringLength(char string[])
  {
      int index = 0;
  
      while (string[index] != '\0')
          index = index + 1;
  
      return index;
  }
  