P2_Q2_Semi corrected

#include<stdio.h>
int main(){
int r;
int coef=1;

printf("Enter no. of rows:\n");
scanf("%d",&r);

for(int i=0;i<r;i++){
 for(int s=0;s<r-i;s++){
   printf(" ");}
 for(int j=0;j<=i;j++){
   if(i==0||j==0){
      coef=1;
      printf("%4d", coef); 
   }
   else
     coef=coef*((i-j+1)/j);
     printf("%4d", coef);}
  printf("\n");}}