Binary pyramid in C programming [on hold]

Binary pyramid in C programming [on hold]

How to write a program to get
1
01
101
0101
10101
.....
my loop is:
for(i=1;i<=num;i++)
{
for(j=1;j<=i;j++)
{
if(i%2==0)
{
printf("0");
}
else
{
printf("1");
}
}
}