cs-142:gofundme [CS Wiki]

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+=GoFundMe=
+==Problem==
+* You have a friend with a cause trying to raise $100K
+* (S)he needs a program to track donations and stop accepting donations when the goal is reached
+* (S)he would like the following information at the end:
+** Total funds raised
+** Total number of donations
+** Average donation amount
+** Maximum donation amount
+** Minimum donation amount
+* Follow the problem solving steps to design a solution
+* Try simulating donations with a random number generator with values between $5 and $5000.
+==Solution==
+<code cpp>
+/* When your program doesn't have inputs, you should still find ways to test your code, perhaps by fixing certain values
+Input: goal=100000, donations=-150, 150000 (negative donation)
+Expected Output: total 149850
+Actual:
+Input: goal=150, donations=155 (example of single donation exceeding goal)
+Expected Output: total, avg, min, max all equal 150, 1 donation
+Actual:
+Input: goal=150, donations = 75, 75 (two donations that equal exactly my goal)
+Expected Output: total = 150, avg = 75, min, max = 75, 2 donations
+Actual:
+Input: goal=150, donations=150 (example of single donation exactly meeting my goal)
+Expected Output: total, avg, min, max all equal 150, 1 donation
+Actual:
+Input: goal=0
+Expected Output: program crashes
+Actual:
+*/
+#include <iostream>
+#include <iomanip>
+#include <ctime>
+using namespace std;
+const double GOAL = 100000;
+const double MAX_VAL = 5000;
+const double MIN_VAL = 5;
+int main()
+{
+	cout << fixed << setprecision(2);
+	double total_donations = 0;
+	int count_of_donations = 0;
+	double max_donation_so_far = 0; // Pick a small enough value that you know it will be immediately replaced as the max value
+	double min_donation_so_far = 1000000000; // Pick a big enough value that you know it will be immediately replaced as the min value (MAX_VAL?)
+	srand(time(0));
+	while (total_donations < GOAL)
+	{
+		// Record each donation (here it is generated as a random value)
+		double donation_amount = (rand() * 1.0 / RAND_MAX) * (MAX_VAL - MIN_VAL) + MIN_VAL;
+		cout << "Donation please: $" << donation_amount << endl;
+		// Add up donation as you go
+		total_donations = total_donations + donation_amount;
+		count_of_donations++;
+		// check if this is the max_donation_so_far
+		if (donation_amount > max_donation_so_far)
+		{
+			max_donation_so_far = donation_amount;
+		}
+		if (donation_amount < min_donation_so_far)
+		{
+			min_donation_so_far = donation_amount;
+		}
+	// Repeat until sum is above 100K
+	}
+	// Output the summary from the program
+	cout << "Congrats! You raised $" << total_donations << endl;
+	cout << "There were " << count_of_donations << " donations" << endl;
+	cout << "Average donation was $" << (total_donations / count_of_donations) << endl;
+	cout << "Max donation was $" << max_donation_so_far << endl;
+	cout << "Min donation was $" << min_donation_so_far << endl;
+	system("pause");
+	return 0;
+}
+</code>

cs-142/gofundme.txt · Last modified: 2015/05/14 17:57 by cs142ta

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