第 10 題 - 解答

#include <stdio.h>

int main()

    int i, j=1, s=0, n;

do{

         printf("請輸入n值：");

         scanf("%d",&n);

    } while(n<0 || n%2==0);

    for(i=1; i<=n; i+=2)

         s=s+(i*i)*j;

         j=j*-1;

    printf("s= %d\n",s);

    return 0;

考試版本

#include <stdio.h>

int main()

    int i, j=1, s=0, n;

do{

         scanf("%d",&n);

    } while(n<0 || n%2==0);

    for(i=1; i<=n; i+=2)

         s=s+(i*i)*j;

         j=j*-1;

    printf("%d\n",s);

    return 0;