Question

编程.输入实数x．计算并输出下列分段函数f(x)的值（保留３位小数）．

数学函数f(x)=(x+1)10*2+2*x+1/x (x<0) 根号x (x大于等于０)输入输出示例input x :10.0f(10.000)=3.162

Answer 1

#include "stdio.h"
#include "math.h"
main()
{ double x,f;
printf("Input x:");
scanf("%lf",&x);
if(x<0)
f=(x+1)/10*2+2*x+1/x ;
else f=sqrt(x);
printf("f(%.3lf)=%.3lf\n",x,f);
}

Answer 2

# include <stdio.h>
# include <math.h>
void s (float i, float j)
{
if (i<0)
{
j=(i+1)*10*2+2*i+1/i;
printf ( "%.3f\n", j );
}
else
{
j = sqrt(i);
printf ( "%.3f\n", j );
}
}
void main ()
{
float x, y; //定义变量y为函数值
printf ("请输入一个数字:");
scanf ("%f", &x);
s (x, y);

}
编译没错误