2003

计算实数的绝对值

保留2位小数

 1 #include <stdio.h>
 2 
 3 int main()
 4 {
 5     double num;
 6     while(scanf("%lf",&num))
 7     {
 8         if(num < 0)
 9         {
10             num = 0 - num;
11         }
12         printf("%.2lf
",num);
13     }
14     return 0;
15 }

参考c++

 1 #include <math.h>
 2 #include <stdio.h>
 3 
 4 int main(void)
 5 {
 6     double r;
 7 
 8     while (scanf("%lf", &r) != EOF)
 9         printf("%.2lf
", fabs(r));
10 
11     return 0;
12 }
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原文地址：https://www.cnblogs.com/ailx10/p/5325483.html