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# Python2.x Python Exercise Instance 46 [ Python 100 Examples](#) **Question:** Find the square of the input number, and exit if the square is less than 50. **Program Analysis:** None Program source code: ## Instance #!/usr/bin/python# -*- coding: UTF-8 -*-TRUE = 1 FALSE = 0 def SQ(x): return x * x print('If the input number is less than 50, the program will stop running.')again = 1 while again: num = int(input('Please enter a number:'))print('The operation result is: %d' % (SQ(num)))if SQ(num)>= 50: again = TRUE else: again = FALSE The output of the above instance is: If the input number is less than 50, the program will stop running.Please enter a number:12The operation result is: 144Please enter a number: 14. The operation result is: 196Please enter a number: 1. The operation result is: 1 [![Image 4: Python 100 Examples](