Lengths of strings : String Length « String « C Tutorial

1. C Tutorial
2. String
3. String Length

#include <stdio.h>
int main(void)
{
  char str1[] = "AAA";
 
  int count = 0;                 
  while (str1[count] != '\0')    /* Increment count till we reach the string terminating character.*/
    count++;                     
    
  printf("\nThe length of the string \"%s\" is %d characters.", str1, count);

  return 0;
}

The length of the string "AAA" is 3 characters.