C++ Pascal triangle

Calculate pascal triangle with one dementional array.

#include <stdio.h>
// Calculate pascal triangle with one dementional array
void main(){
 int j,i,arr[100] , numLine ;
 printf(" Calculate pascal triangel. Enter the number of elements you want ? ");
 scanf("%d",&numLine);
 arr[0]=1;
 for (j=1; j<numLine; j++) printf("  ");
 printf("%4d \n",arr[0]);
 for (i=1; i<numLine; i++) {
  arr[i] = 1;
  for (j=i-1; j>=1; j--) arr[j] = arr[j] + arr[j-1];
  for (j=i+1; j<numLine; j++) printf("  ");
  for (j=0; j<=i; j++) printf("%4d",arr[j]);
  printf("\n");
 }
}