Develop a C++ program that reads a number from 0 to 100 a shows on the standard output the corresponding grade according to the grading scale specified below. If the input is not in the interval [0, 100) the output of the program will show the warning; "Test scores must be in the interval [0, 100)". 

Grading Scale 

90-100%A 

80-89%B 

70-79%C 

60-69%D 

0-59% F 

Concepts in practice: Concatenation of if-else statements.

Answer rating: 100% (QA)

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