Commonly strings consist of ASCII characters, some are printable, some are in the backgrounds like the bell, carriage return, linefeed, tab and so forth. This code displays a table of ASCII characters and the corresponding decimal value. As always, you are encouraged to learn here.

/* display the ASCII character table */

#include <stdio.h>

int main()
{
  int k;
  
  for ( k = 14; k < 256; k++ )
  {
    printf ( "%3d = %c ",k, k );
  }
    
  getchar();   /* wait for key */
  return 0;
}
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