Explanation of the replacements:

Q$1$: i $<=$ iMax $$ The loop continues as long as i is less than or equal to iMax.

Q$2$: i$++$ The loop increments i after each iteration.

Q$3$: compare$($ptr$[$i$],$ ptr$[$i $+1])$ The comparison is done using the function pointer compare.

Q$4$: Swap$($&ptr$[$i$],$ &ptr$[$i $+1])$ If the comparison condition is true, the elements are swapped.

Q$5$: &IsLess $$ Assign the function pointer fptr to point to the IsLess function.