请问这个c程序 如何用嵌套的条件运算符计算，看下我的对吗？

Question

#include"stdio.h"
#include"math.h"
void main()
{
float x;
float y;
printf("input x:");
scanf("%f",&x);
(0<=x&&x y=sin(x)+cos(x):
(40 y=exp(x)-1:
(60 y=log(x+1):
(0>x&&x>=80);
printf("y=0");
printf("%f",y);
}

Answer 1

 #include "stdio.h"
#include "math.h"
int main()
{
float x;
float y;
printf("input x:");
scanf("%f",&x);
y=(0<=x&&x<20)?5*x+11:
(
    (20<=x&&x<40)?sin(x)+cos(x):
    (
        (40<=x&&x<60)?exp(x)-1:
        (
            (60<=x&&x<80)?log(x+1):0
        )
    )
);
printf("%f",y);
}