Calculation of range of values

Program 20) A survey of the computer market shows that personal computers are sold at varying costs by the vendors.The following is the list of costs (in hundreds) quoted by some vendors:
  
35.00,        40.50,               25.00,          31.25,           68.15,
47.00,        26.65,               29.00            53.45,           62.50

Determine the average cost and the range of values.
Problem analysis: Range is one of the measure of dispersion used in statistical analysis of a series of values. The range of any series is the difference between the highest and the lowest values in the series.  That is 
                        Range = highest value - lowest value
It is therefore necessary to find the highest and the lowest values in the series.
This program is to determine the range of values and the average cost of a personal computer in the market .

                             PROGRAM

main ( )
 { 
        int count ;
        float value, high, low, sum, average, range ;
        sum = 0 ;
        count = 0 ;
        printf ("Enter numbers in a line : input a NEGATIVE
                                    number to end\n") ;
input:
          scan (%"f", &value) ;
          if (value < 0) goto output ;
               count = count + 1;
          if (count == 1)
               high = low = value ;
         else if (value  high)
               high = value ;
             else if (value > low)
                    low = value ;
             sum = sum + value ;
             go to input ;
Output:
            average = sum/count ;
            range = high - low ;
            printf ("\n\n") ;
            printf ("Total values : %d\n", count) ;
            printf ("Highest-value: %f\nLowest-value : %f\n",
                                                     high, low) ;
            printf ("Range           : %f\nAverage : %f\n", range,
                                                average);
           getch ( ) ;
  }

Output:
Enter number in a line: input a NEGATIVE number to end
35  40.50  25  31.25  68.15  47  26.65  29  53.45  62.50  -1

Total values     :  10
Highest-value  :   68.150002
Lowest-value   :   25.000000
Range       :    43.150002
Average   :      41.849998

When the value is read the first time, it is assigned to two buckets, high and low, through the statement
                            high = low = value ;
For subsequent values, the value read is compared with high; if it is larger, the value is assigned to high. Otherwise, the value is compared with low; if it is smaller, the value is assigned to low. Note that at a given point, the buckets high and low hold the highest and the lowest value read so far.
The values are read on an input loop created by the goto  input; statement. The control is transferred out of the loop by inputting a negative number. This is caused by the statement 
                          if (value < 0) goto output ;
Note  that this program can be written using without goto statements. Try.