March 16, 2010

遞迴定義1X2+2X3+........+NX(N-1)之2

#include<stdio.h>
#include<stdlib.h>
int rsum(int n)
{
    if(n!=1)
   return rsum(n-1)+n*(n-1);
    else
    return 0;
}
int main(void)
{
  int a;
    printf("Given  a  number:\n");
     scanf("%d",&a);
     printf("We get the result:\n");
     printf("%d\n",rsum(a));
         
          system("pause");
          return 0;
          }

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