对练习7进行修改，让它使用一个函数来返回计算值

/*
对练习7进行修改，让它使用一个函数来返回计算值。
*/
#include <stdio.h>
double TheEffect(double x,double y);
int main (void)
{
double x,y,effect;
printf("Please input two double./n");
while(2 == scanf("%lf%lf",&x,&y))
{
effect = TheEffect(x,y);
printf("The Effect is %lf/n",effect);
}
system("pause");
return 0;
}
double TheEffect(double x,double y)
{

return (x > y)?(x - y):(y - x) / ( x * y) ;
}