In C, square matrices can be represented using two-dimensional arrays. Here is an example of how to create and print a square matrix of size n x n, where n is a constant value defined at the beginning of the program:

```c
#include <stdio.h>

#define N 3  // Define the size of the square matrix

// Define a function to print a square matrix
void printSquareMatrix(int matrix[N][N]) {
    printf("Square Matrix:\n");
    for (int i = 0; i < N; i++) {
        for (int j = 0; j < N; j++) {
            printf("%d ", matrix[i][j]);
        }
        printf("\n");
    }
}

// Demonstration of the square matrix function
int main() {
    int matrix[N][N] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};  // Define a square matrix
    s Print the square matrix
    return 0;
}
```

In this example, the `printSquareMatrix` function takes a two-dimensional array of integers as input and prints each element of the array in a matrix format. The `main` function defines a square matrix of size 3 x 3 using an initializer list and then calls the `printSquareMatrix` function to print the matrix.

Operations on square matrices include addition, subtraction, multiplication, and finding the determinant and inverse. These operations can be implemented using various algorithms such as the Gaussian elimination method, LU decomposition, and the Cramer's rule.

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