Перестановка элементов квадратной вещественной матрицы

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define n 4
 
void display_matrix(int a[][n]) {
int i, j;
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
printf("%5d", a[i][j]);
}
printf("\n");
}
}
int main(void)
{
/*const int n = 4;*/
int a[n][n], i, j, iteration;
int max, max_i, max_j;
srand(time(NULL));
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
a[i][j] = rand() % 20 - 10;
}
}
printf("Initial matrix:\n");
display_matrix(a);
for (iteration = 0; iteration < n; iteration++) {
max_i = 0;
max_j = 1;
for (i = 0; i < n; i++) {
for (j = 0; j < n; j++) {
if (!(i == j && i < iteration)){
if (a[i][j] > a[max_i][max_j]) {
max_i = i;
max_j = j;
}
}
}
}
max = a[max_i][max_j];
a[max_i][max_j] = a[iteration][iteration];
a[iteration][iteration] = max;
printf("Iteration %d: swapped elements (%d,%d) and (%d,%d):\n",
iteration + 1, max_j + 1, max_i + 1, iteration + 1, iteration + 1);
display_matrix(a);
}
printf("Hello, World!");
return 0;
}