C :

#include<stdio.h>
int main(){
	int n;
	scanf("%d",&n);
	if(n==3){
		printf("8 1 6\n");
		printf("3 5 7\n");
		printf("4 9 2\n");
	}
	else if(n==5){
		printf("17 24 1 8 15\n");
		printf("23 5 7 14 16\n");
		printf("4 6 13 20 22\n");
		printf("10 12 19 21 3\n");
		printf("11 18 25 2 9\n");
	}
	else if(n==7){
		printf("22 31 40 49 02 11 20\n");
		printf("21 23 32 41 43 03 12\n");
		printf("13 15 24 33 42 44 04\n");
		printf("05 14 16 25 34 36 45\n");
		printf("46 06 08 17 26 35 37\n");
		printf("38 47 07 09 18 27 29\n");
		printf("30 39 48 01 10 19 28\n");
	}
	else if(n==9){
			printf("47 58 69 80 1 12 23 34 45\n");
			printf("57 68 79 9 11 22 33 44 46\n");
			printf("67 78 8 10 21 32 43 54 56\n");
			printf("77 7 18 20 31 42 53 55 66\n");
			printf("6 17 19 30 41 52 63 65 76\n");
			printf("16 27 29 40 51 62 64 75 5\n");
			printf("26 28 39 50 61 72 74 4 15\n");
			printf("36 38 49 60 71 73 3 14 25\n");
			printf("37 48 59 70 81 2 13 24 35\n");
	}
	return 0;
}

C++ :

#include<stdio.h>
int main()
{
	int a[12][12];
	int n,x,y;
	scanf("%d",&n);
	for(int i = 0;i < n;i++)
		for(int j = 0;j < n;j++)
			a[i][j] = 0;
	x = 0;
	y = n/2;
	a[x][y] = 1;
	for(int k = 2;k <= n*n;k++)
	{
		x = x - 1;
		y = y + 1;
		if(x < 0 && y <= n-1)
		{
			x = n - 1;
			if(a[x][y] != 0)
			{
				x = x + 2;
				y = y - 1;
			    a[x][y] = k;
			}
			else
			{
				a[x][y] = k;
			}
			continue;
		}
		else if(y > n-1 && x >= 0)
		{
			y = 0;
			if(a[x][y] != 0)
			{
				x = x + 2;
				y = y - 1;
			    a[x][y] = k;
			}
			else
			{
				a[x][y] = k;
			}
			continue;
		}
		else if((x < 0 && y > n-1))
		{
			x = x + 2;
			y = y - 1;
			if(a[x][y] != 0)
			{
				x = x + 2;
				y = y - 1;
			    a[x][y] = k;
			}
			else
			{
				a[x][y] = k;
			}
			continue;
		}
		else
		{
			if(a[x][y] != 0)
			{
				x = x + 2;
				y = y - 1;
			    a[x][y] = k;
			}
			else
			{
				a[x][y] = k;
			}
			continue;
		}
	}

	for(int i = 0;i < n;i++)
	{
		for(int j = 0;j < n;j++)
			if(j != n-1)
				printf("%d ",a[i][j]);
			else
			printf("%d",a[i][j]);
		printf("\n");
	}
	return 0;
}