输出技巧方法2种

#include <stdio.h>int main(){int n;scanf("%d",&n);int i;for(i=2;i<=(2*n);i=i+2){printf("%d\n",i);}return 0;}

上面是方法1.下面是方法2

#include <stdio.h>int main(){int n;int i;scanf("%d",&n);for(i=1;i<=n;i++){printf("%d\n",2*i);}return 0;}