From 19419d86cb88981df7973b08a0da6373abfba566 Mon Sep 17 00:00:00 2001
From: Oskar <open7software@gmail.com>
Date: Sun, 6 Oct 2024 14:09:53 +0200
Subject: more exercises

---
 8p7.cpp | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 8p7.cpp

(limited to '8p7.cpp')

diff --git a/8p7.cpp b/8p7.cpp
new file mode 100644
index 0000000..93b9c50
--- /dev/null
+++ b/8p7.cpp
@@ -0,0 +1,53 @@
+#include <iostream>
+#include <fstream>
+#include "sales_data.hpp"
+
+/*
+ *
+ * 8.7
+ *
+ *
+ */
+
+int main (int argc, char **argv) {
+
+	if(argc < 3 || argc > 4) {
+		return -1;
+	}
+	
+	std::ifstream file(argv[1]); // open first file to read
+	std::ifstream out_file_chk(argv[2], std::ifstream::ate); // Open 2nd file to check if it exists
+	if(!out_file_chk.is_open()) { // If it does not exist create it
+		std::cout << "File created." << std::endl;
+		std::ofstream create_file(argv[2]);
+		if(create_file.fail()) { return -1; }
+		create_file.close();
+	}
+	
+	if(file.fail()) { // check if first file failed to open
+		return -1;
+	}
+	
+	if(out_file_chk.tellg() > 0) { // Check if the 2nd file had any data
+		std::cerr << "This file has data" << std::endl;
+		return -1;
+	}
+
+	out_file_chk.close(); 
+	std::ofstream out_file(argv[2]); // Finally open for writing
+	SalesData total;
+	if (read(file, total)) {
+		SalesData trans;
+		while(read(file, trans)) {
+			if (total.isbn() == trans.isbn())
+				total.combine(trans);
+			else {
+				print(out_file, total) << std::endl;
+				total = trans;
+			}
+		}
+		print(out_file, total) << std::endl;
+	} else {
+		std::cerr << "No data?!" << std::endl;
+	}
+}
-- 
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