(Algebra: add two matrices) Write a function to add two matrices a and b and save the result in c.

The header of the function is
const int N = 3 ;void addMatrix(const double a[][N],const double b[][N], double c[][N]);
Each element Cj is a ij + bij. Write a test program that prompts the user to enter two 3×3 matrices and displays their addition. Here is a sample run:

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