Hello World!"; ?> Body temperature is $body_temp degree Fahrenheit"; // now, assign a new value to the variable $body_temp = 37.0; // display the new variable substitied in a mixed string echo " ( $body_temp degrees Celsius )

"; $str1 = "If you are \"happy\" and you 'know' it ... "; // use "escape" character (\) for quote inside qoute $str2 = "clap your hand!"; $str = $str1 . $str2; echo $str."
"; print "body_temp is " . $body_temp .'
'; print("body_temp is " . $body_temp .'
'); printf("body_temp is " . $body_temp .'
'); printf("body_temp is %5.3f" , $body_temp , '
'); ?>