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float math_constants  = 2.71828; Im confused about adding 2.71828 to index 0 of math_constants.
I'm assuming you're on task 2.
After task 1 you should have had
This gives us an array of type float with room for 2 floats. Since array indices are zero based this means we can assign a float value to
math_constants and to
math_constants. No other indices would be valid.
Task 2 states "Assign the number 2.71828 to index 0 of math_constants"
Since the index is 0 we make sure that is what we put between the brackets.
math_constants = 2.71828;