How does free know how much to free?

Question

In C programming, you can pass any kind of pointer you like as an argument to free, how does it know the size of the allocated memory to free? Whenever I pass a pointer to s

Answer 1

When we call malloc it's simply consume more byte from it's requirement. This more byte consumption contain information like check sum,size and other additional information. When we call free at that time it directly go to that additional information where it's find the address and also find how much block will be free.