Printing pascal triangle in C?

Answer 1

the logic i have used is nCr => n!/(r!*(n-r)!)

for example the outer loop counter is 'n' and the inner loop counter is 'r' , then the corresponding element of the pascal's triangle will be nCr.

keep in mind that both the loops will have to start from zero.

#include<stdio.h>

main()
{
int num,i,j,k,space;
int difffact=1,diff,n,r,x,y,comb=0,nfact=1,rfact=1;
printf("please enter the number of lines\n");
scanf("%d",&num);

k=num-1;
space=num-1;
for(i=0;i<num;i++)
{
k=space--;
for(;k>0;k--)
{
printf(" ");
}
for(j=0;j<=i;j++)
{
comb=0;
nfact=1;
rfact=1;
difffact=1;

for(n=i;n>=1;n--)
nfact=nfact*n;

for(r=j;r>=1;r--)
rfact=rfact*r;

diff=i-j;
for(;diff>=1;diff--)
difffact=difffact*diff;

comb=(nfact/(rfact*difffact));
printf("%d ",comb);
}
printf("\n");
}
}