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Answer to Question #77478 in C++ for Erik Rubino

Question #77478
Magic squares. An n × n matrix that is filled with the numbers 1, 2, 3, . . ., n2 is a magic square if the sum of the elements in each row, in each column, and in the two diagonals is the same value.

Write a program that reads in 16 values from the keyboard and tests whether they form a magic square when put into a 4 × 4 array. You need to test two features:
1.Does each of the numbers 1, 2, ..., 16 occur in the user input?
2.When the numbers are put into a square, are the sums of the rows, columns, and diagonals equal to each other?
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