Question

C语言中问题warning C4244: 'function' : conversion from 'double ' to 'int ', possible loss of data

warning C4244: 'function' : conversion from 'double ' to 'int ', possible loss of data
warning C4761: integral size mismatch in argument; conversion supplied
哪里出错了，怎么改啊

#include<stdio.h>
int main()
{
double sign(int x);
double a,b;
scanf("%lf",&a);
b=sign(a);
printf("%.1lf\n",b);
return 0;
}
double sign(int x)
{
double c;
if(x>0)
c=x*2.5;
else if(x==0)
c=0;
else if(x<0)
c=x*x;
return c;
}

Answer 1

#include<stdio.h>

double sign(double x);

int main()
{
        double a,b;

        scanf("%lf",&a);
        b=sign(a);
        printf("%.1lf\n",b);
        return 0;
}

double sign(double x)
{
        double c;

        if( (int)(x) > 0)
                c = x*2.5;
        else if( (int)(x) == 0)
                c = 0;
        else if((int)(x) < 0)
                c = x*x;

        return c;
}

建议在函数sign里面实现，类型强制转化。

追问

除了这个 还能有其他改法吗