C实例 帕斯卡三角

#include <stdio.h>



int factorial(int n) {

   int f;



   for(f = 1; n > 1; n--)

      f *= n;



   return f;

}



int ncr(int n,int r) {

   return factorial(n) / ( factorial(n-r) * factorial(r) );

}



int main() {

   int n, i, j;



   n = 5;



   for(i = 0; i <= n; i++) {

      for(j = 0; j <= n-i; j++)

         printf("  ");



      for(j = 0; j <= i; j++)

         printf(" %3d", ncr(i, j));



      printf("\n");

   }

   return 0;

}