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The Grading Ladder

Easy

Read a marks value and print its grade using an else-if ladder: 90 and above is A, 75 to 89 is B, 60 to 74 is C, 40 to 59 is D, below 40 is F. Guard the scanf first: if the input is not a number, print "invalid input" and return 1.

Success Criteria

Your code must pass 4 test case(s) to complete this exercise. 3 hint(s) are available if you need help.

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