C Program to print Pascal's Triangle

#include<stdio.h>
void main()
{
int a[10][10];
int i,j,c,n;
printf("Enter how many lines do you want");
scanf("%d",&n);
a[1][1]=1;
printf("%5d",a[1][1]);
a[2][1]=1;a[2][2]=2;a[2][3]=1;
printf("%d %d %d",a[2][1],a[2][2],a[2][3]);
for(i=3;i<=n;i++)
{
a[i][1]=1;
printf("%d",a[i][1]);
j=2;c=3;
while(j<=i)
{
a[i][j]=a[i-1][c-1]+a[i-1][c-2];
printf("%5d",a[i][j]);
c=c+1;
j=j+1;
}
a[i][j]=1;
printf("%d",a[i][j]);
}
}