How this is possible?

Question

/* If the Values are ending with .5 or .0 the condition is True but I don't know how this is happenning. */

#include <stdio.h>
int main() {
float s=2.4; //try with 2.0 or 2.5
double t=2.4;
if(s==t){
printf ("True"); }
else{
printf ("False"); }
return 0;
}

Answer 1

The floating point format cannot represents .4 perfectly, while it can perfectly represents .5 and .0
A double data type is more precise than float, so 2.4 in float and in double won't be the same
You can do this
printf("%.16f\n%.16f", (float)2.4, 2.4);
And you can see that double is more precise and they have different value