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sometimes in our program we may need to know how many records are there in a binary file and for this purpose we can use the function f tail if theyamp;#39;ll returns the number of bytes written up to the file pointer position so when we open the file in read mode then the file pointer is actually at the beginning of file so now if I apply the function f tail right now itamp;#39;s going to return the value 0 because now the file pointer is at the very beginning of the file so let me declare a long variable in order to hold the size so now if I call the FEL function we need to pass the file pointer let me print the value of size itamp;#39;s going to be 0 in this case let me go ahead and run this program you can see that size equals to 0 now if I move the file pointer at the end of file using F sake then again I will apply the function f them then itamp;#39;s going to return the total size of the file so in order to move the file pointer at the end of file it should be 0 l and then -