1
0 1
0 1 0
1 0 1 0
#include<stdio.h>
#include<conio.h>
void main()
{
int i,j,no,k=1;
clrscr();
printf("enter number: ");
scanf("%d",&no);
for(i=1; i<=no; i++)
{
for(j=i; j<=no-1; j++)
{
printf(" ");
}
for(j=i; j>=1; j--)
{
printf("%d ",k%2);
k++;
}
printf("\n");
}
getch();
}
/* output:
enter number: 4
1
0 1
0 1 0
1 0 1 0
*/
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