Write a C++ program that • reads in one positive integer value, x, from a file called input.txt and • writes to a file called output.txt a right-angled isosceles triangle of base length x, made of 'asterisk' (*), 'single space' and 'carriage return’ characters only. The hypotenuse in this case must face the left, with its equal sides on the right and bottom. Your code should be able to draw a right angled triangle for any given positive integer. First draw a flow chart and then attempt the code. Example 1 For example your input file may contain the value 4: Listing 5: Example of input .txt 1 4 Your output file, output .txt, for the given input.txt, should appear as follows: Listing 6: Example of output.txt -23 4

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