finding largest number in 2 dim array

/*pgr to find largest number in 2 dimensional array
written by sekhar
written on 20/07/07
modified on 20/07/07 */
#include
main()
{
int a[3][3],i,j,t;
for(i=0;i<=2;i++)
{
for(j=0;j<=2;j++)
{
scanf("%d",&a[i][j]);
}
}
for(i=0;i<=2;i++)
{
for(j=0;j<=2;j++)
{
if(a[0][0]<=a[i][j])
{
t=a[0][0];
a[0][0]=a[i][j];
a[i][j]=t;
}
// printf("\n%d",a[0][0]);
}
}
printf("greatest\n%d",a[0][0]);
}