Reference no: EM13936629
Prime Numbers?
You are to find all the prime numbers between 90,000 and 100,000 and print them out.
One way to do this (the way you will have to do this) is fill an array with the values from 1 to 100,000. Start with 2 and go thru the array and every 2nd location in the array zero it out. You just eliminated any value that is divisible by 2. Now move to the next value (after 2) which will be 3, and go thru the array and zero out every 3rd location of the array. You just eliminated any number divisible by 3. Now move to the next location after 3 which is 4, and you see it is zero. Skip it because you have eliminated all multiples of 4 by eliminating multiples of 2. So move to the next (5) and eliminate multiples of 5. (Be sure not to zero out the 2,3 and 5 etc since they are prime numbers, just their multiples.) So if the next location is not 0, then traverse through the array and eliminate its multiples. Do this for the entire array.
You do not have to loop from 1 to 100,000. Find what value you can stop at in this algorithm which is much less than 100,000.
Print out the nonzero values in the array and that will be the prime numbers. Print out the numbers 7 per line and make sure they line up on the last digit. (setw(8)???)
You are to use an array for the data and use pointers to move through the array to solve this problem. The only place to use the [ ] is in the declaration, no [ ] syntax in any other code in the program.
Attachment:- prime.cpp
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