Thread: Help I am stuck with an unknown type of error.

I'm a complete novice to C programming and also new to this type of online discussion so bear with me, help me and correct me if I'm wrong anywhere. Here is the code:

Code:

//this program calculates the average miles travelled per gallon of fuel.
#include <stdio.h>
//start of main
int
main (void)
{


float gallons, miles, average = 0.0, counter = 0.0;    //declaration/initialisation
  printf ("\t\t\t%s\n", "CALCULATE MILES PER GALLONS FOR YOUR CAR");    //message
//start of while loop
  while (gallons != -1.0)
    {                //condition to end program
      printf ("%s", "Enter the gallons used(-1 to end): ");    //prompt
      scanf ("%f\n", &gallons);    //input
      if (gallons != -1.0)
    {            //condition to take further input; start of if
      printf ("%s", "Enter the miles driven: ");    //prompt
      scanf ("%f", &miles);    //input
      average += miles / gallons;    //summation of all averages
      counter++;        //incrementing counter
      printf ("%s%0.2f\n\n", "The miles/gallon for this tank was ", average);    //printing current average
    }            //end of if
    }                //end of while
  if (counter != 0.0)
    {                //start of if
      printf ("%s%0.2f", "The overall average miles/gallon was ", average / counter);    //printing final average
    }                //end of if
  else


puts ("Invalid Input..");


}                //end of main

I know this maybe a repeat question but this program compiles without a syntax error and runs upto second printf function and than hangs or something which I'm unable to understand, what kind of error is this? I don't find any logical error in the code. Thank You.

Remove the "\n" from the scanf() on line 15.

Please clean up the indent style of your source code. Choose one style and stick with it. Some editors can be set to use one of the styles. Check the documentation for your editor.

Thank You for your help, now its running.

Thank You, now it's running. Actually I was trying to compile it online so I used this option to beautify which added this extra spaces everywhere, I usually write a very condensed code.