题解 - 【入门】超市大打折

-3

hetao10524952 LV 10 @ 2023-7-30 14:41:12

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
    double a=3.14159265857;
    cout << fixed << setprecision(x) << a;
    x代表具体要保留几位。
     returb 0;
    请务必自己多敲几遍代码，这个单词比较长避免考场出到原题自己单词忘了
}
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-5
hetao15155991 LV 8 @ 2023-11-4 20:18:06

实在是简单呀
-11
mayuying LV 8 SU @ 2022-5-10 14:45:41
保留 x 位小数

方法 1
- 头文件：#include <cstdio>
- 语句： printf("%.xf", a);
方法 2
- 头文件：#include<iostream>、#include<iomanip>
- 语句：cout << fixed << setprecision(x) << a;
注意

如果题目说保留 $x$ 位小数，那么就按照这种方式输出就可以了。
```
#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
    double a=3.14159265857;
    cout << fixed << setprecision(x) << a;
    x代表具体要保留几位。

    请务必自己多敲几遍代码，这个单词比较长避免考场出到原题自己单词忘了
}
```
```
#include<iostream>
#include <cstdio>
using namespace std;
int main()
{
    double a=3.14159265857;
    printf("%.xf", a);
    x代表具体要保留几位。

    请务必自己多敲几遍代码，这个单词比较长避免考场出到原题自己单词忘了
}
```
- hetao342043@hetao101.com @ 2022-7-7 23:12:31
  
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- hetao794786 @ 2022-8-12 22:05:13
  
  @张文昊 (hetao342043@hetao101.com) 请不要刷屏，如果不喜欢他人的题解，也请不要刷屏，要维护秩序，谢谢
- hetao794786 @ 2022-8-12 22:05:48
  
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- hetao2940092 @ 2022-8-29 12:43:10
  
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- hetao2940092 @ 2022-8-29 12:46:14
  
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- hetao4050712 @ 2023-2-26 15:20:59
  
  老师，没学过printf怎么办？😕 【忠诚】【忠诚】
- hetao4565091 @ 2023-5-12 12:58:07
  
  张文昊 (hetao342043@hetao101.com) 请不要刷屏
- hetao4565091 @ 2023-5-12 12:58:33
  
  @张文昊 (hetao342043@hetao101.com) 请不要刷屏
- hetao842180 @ 2024-1-24 12:38:02
  
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- hetao36337224 @ 2024-2-5 17:47:22
  
  @