Answered: Write a pseudocode or algorithm for a C…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Write a pseudocode or algorithm for a C program that will ask a user for a certain number and display all prime numbers from 1 to that number using the for loop.

#include <iostream>
#include <conio.h>
using namespace std;
int main() {
int num, i, usernum;
// Ask user to input a number
cout << "Enter a number: ";
cin >> usernum;
cout << endl << "All prime numbers from 1 up to " << usernum << " are: " << endl;
for(num = 2; num <= usernum; num++) {
for(i = 2; i <= (num / 2); i++) {
if(num % i == 0) {
i = num;
break;
}
}
// If user input prime number
if(i != num) {
cout << num << " ";
}
}
getch();
return 0;
}

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