pattern program

void main()
{
int r,c,n,i;

scanf("%d",&n);
for(r=1;r<=n;r++)
{
for(c=1;c<=r;c++)
{
if(r%2==0)
//printf("%d",r/2);
printf("0");
else
//printf("%c",'A'+r/2);
printf("1");
}
printf("\n");

}

}
input: 5
output:
1
00
111
0000
11111