使用c语言写函数计算sigmoid函数，sigmoid函数的表达式为y=1+e−x1​

#include <stdio.h>
#include <math.h>

double sigmoid(double x) {
return 1 / (1 + exp(-x));
}

int main() {
double x, y;
printf("Please input x: ");
scanf("%lf", &x);
y = sigmoid(x);
printf("sigmoid(%lf) = %lf\n", x, y);
return 0;
}