Difference between *ptr += 1 and *ptr++ in C

Question

I just started to study C, and when doing one example about passing pointer to pointer as a function\'s parameter, I found a problem.

This is my sample code :

Answer 1

Let's apply parentheses to show the order of operations

a + b / c
a + (b/c)

Let's do it again with

*ptr   += 1
(*ptr) += 1

And again with

*ptr++
*(ptr++)

• In *ptr += 1, we increment the value of the variable our pointer points to.
• In *ptr++, we increment the pointer after our entire statement (line of code) is done, and return a reference to the variable our pointer points to.

The latter allows you to do things like:

for(int i = 0; i < length; i++)
{
    // Copy value from *src and store it in *dest
    *dest++ = *src++;

    // Keep in mind that the above is equivalent to
    *(dest++) = *(src++);
}

This is a common method used to copy a src array into another dest array.