72 lines
1.6 KiB
C++
72 lines
1.6 KiB
C++
//
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// main.cpp
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// Program 1
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//
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// Created by Liyang Zhang 2016 on 6/10/13.
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// Copyright (c) 2013 Liyang Zhang 2016. All rights reserved.
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//
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//precompiler directives:
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#include <iostream>
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#include <iomanip>
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#include <fstream>
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#include <cmath>
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using namespace std;
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int main( )
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{
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// ********************* PROBLEM 1 *********************
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double a[5];
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for (int i=0;i<5;i++) {
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cout << "Please enter a number: ";
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cin >> a[i];
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}
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cout << endl << "The average of your numbers is " << (a[0]+a[1]+a[2]+a[3]+a[4])/5 << "." << endl;
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cout << endl;
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// ********************* PROBLEM 2 *********************
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for (int i=0;i<5;i++) {
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cout << "Please enter a number: ";
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cin >> a[i];
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}
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double product = a[0]*a[1]*a[2]*a[3]*a[4];
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cout << endl << "The product of your numbers is " << product << "." << endl;
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// ********************* PROBLEM 3 *********************
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double sum = 0;
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for (int i=25;i<=50;i++) {
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sum += i;
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}
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cout << endl << "The sum of the consecutive integers from 25 to 50 is " << sum << "." << endl;
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// ********************* PROBLEM 3 *********************
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product = 1;
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for (int i=3;i<=11;i+=2) {
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product *= i;
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}
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cout << endl << "The product of the odd integers from 3 to 11 is " << product << "." << endl;
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// ********************* PROBLEM 4 *********************
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double frac = 1, decimal = 1;
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for (int i=2;i<=6;i++) {
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frac *= i;
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decimal /= i;
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}
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cout << endl << "The product of 1/2, 1/3, 1/4, 1/5, and 1/6 is 1/" << frac << ", or " << decimal << "." << endl;
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return 0;
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}
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