babbage% gcc -o max-min max-min.c && max-min 
Program to process real numbers.
Enter number of reals: 6
Enter 6 numbers: 1 2 4 6 8 9
Maximum:   9.00
Minimum:   1.00
Average:   5.00

Enter the index (1..n) of the number to be printed: 5
The 5 th number is 8.00
babbage% max-min
Program to process real numbers.
Enter number of reals: 5
Enter 5 numbers: 4 2 1 3 5
Maximum:   5.00
Minimum:   1.00
Average:   3.00

Enter the index (1..n) of the number to be printed: -3
The -3 th number is 3657243390666508700000000000000000000000000000000000000000
000000000000000000000000000000000000000000000000000000000000000000000000000000
000000000000000000000000000000000000000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000000000000000000000000.00