why does it print "Good" when we input s=3.6????

Question

#include<stdio.h>

int main(){
float s;
scanf("%f",&s);
if(s>=3.6) printf("Excelent");
else printf("Good");

return 0;
}

Answer 1

Float precision

Read this article about comparing float value in c language.

https://www.geeksforgeeks.org/comparison-float-value-c/

Answer 2

3.6 float is 3.59999...
And you're comparing it to
3.6 double (3.60000...)