What does eps mean in c language?

In C language, eps refers to precision. It is mainly used in floating-point number operations, because C language floating-point numbers store approximate values.

#Calculation will cause errors, so generally the calculation is meaningless if it is below a certain value. This threshold is eps, which is the accuracy.

eps is a constant specified in advance in the function program. The default eps = 2^(-52) controls the iteration accuracy, which is equivalent to infinity in calculus. Small value.

In matlab

eps(1/2) = 2^(-53)
eps(1) = 2^(-52)
eps( 2) = 2^(-51)

For example:

#include<stdio.h>
void main(){
long fun(int n);
int i;
double e=0;
double eps=1e-6;    //eps表示精度 此处指10的-6次方
for(i=0;1.0/fun(i)>eps;i++)
{
e+=1.0/fun(i);
}

printf("e=%lf\n",e);
}
long fun(int n)    //求n!的函数
{
if(n==0)
return 1;
else
return n*fun(n-1);
}

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