In the train time table program, add loops to check that the times entered
are valid (ie times entered are between 0 and 24 hours for the start and stop
times and that the frequency and journey times are between 1 and 60
minutes).
Prevent the program from proceeding until suitable values are entered.
Write a program which reads in a set of positive value real number values
terminated by a negative value and prints out the sum of all these values.
Write a program to find the largest, smallest and average values in a
collection of n numbers entered by the user where n is the
first data item entered.
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