Transpose a square matrix within itself..

#include <stdio.h>

int main(void)
{
int arr[3][3], i, j, tmp;

for(i = 0 ; i < 3 ; i++)
{
printf("\nRow %d\n", i + 1);
for(j = 0 ; j < 3 ; j++)
{
printf("\tValue %d :", j + 1);
scanf("%d", &arr[i][j]);
}
}

printf("\nDisplaying original matrix : ");
for(i = 0 ; i < 3 ; i++)
{
printf("\n");
for(j = 0 ; j < 3 ; j++)
printf("\t%d", arr[i][j]);
}

for(i = 0 ; i < 3 ; i++)
{
for(j = 0 ; j < i ; j++)
{
tmp = arr[i][j];
arr[i][j] = arr[j][i];
arr[j][i] = tmp;
}
}

printf("\nDisplaying transposed matrix : ");
for(i = 0 ; i < 3 ; i++)
{
printf("\n");
for(j = 0 ; j < 3 ; j++)
printf("\t%d", arr[i][j]);
}

return 0;
}