%%%%%%%% 

 1  1 //强制类型转换
 2  2 // https://blog.csdn.net/chaipp0607/article/details/54834954 
 3 
 4     double x;
 5     int y1,y2;
 6     scanf("%lf",&x);
 7     y1=int(x);
 8     y2=int(round(x));
 9     printf("%d\n",y1);
10     printf("%d\n",y2);
11     /*
12     5.9
13     5
14     6
15     */

 

 1 scanf("%lf",&x);
 2 int m=x;
 3 cout<<m<<endl; 
 4 5.7
 5 5
 6 5.2
 7 5
 8 想几舍x入最简单的办法是在原数上加个1-0.x就可以了，
 9 如：想四舍五入就——      5.4   int(5.4+0.5)=5
10                         5.5   int(5.5+0.5)=6
11 又如：想二舍三入就——    5.2   int(5.2+0.7)=5  
12                         5.3   int(5.3+0.7)=6

 

 

1   3+0.5 会自动转换成double 
2   int a;
3   ll  b;
4   a+b //自动换为ll

 

posted on 2018-07-20 15:02  cltt  阅读(1280)  评论(0)  编辑  收藏  举报

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