百度贴吧表情分析

#include <stdio.h>

#include <math.h>

double func(double x)

{

return exp(x);

}

void main(){

double h,x;

h=0.1;

printf("Input x: ");

scanf("%lf",&x);

for(;fabs((func(x+h)-func(x))/h)>pow(10,-5);)

{

h=h-0.01;

}

printf("h=%.4lf\n",h);

getch();

}