more exercises

2 files changed, 146 insertions, 0 deletions

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;
+	}
+}
diff --git a/8p8.cpp b/8p8.cpp
new file mode 100644
index 0000000..5b68c89
--- /dev/null
+++ b/8p8.cpp
@@ -0,0 +1,93 @@
+#include <iostream>
+#include <fstream>
+#include "sales_data.hpp"
+
+/*
+ *
+ * 8.8
+ *
+ *
+ * Yes, i stole this function from one of my other projects to be used here.
+ * I think it works really well here.
+ */
+
+int choice (const int mode) {
+	
+	int FUNCTION_FAILURE = -1;
+	int MODE_NORMAL = 0;
+	int MODE_YES = 1;
+	int MODE_NO = 2;
+	int MODE_FORCE = 3;
+    char choice;
+    char modechoice;
+    do {
+		if (mode == MODE_NORMAL) { fputs("[Y / N] ? ", stdout); }
+		if (mode == MODE_YES) { fputs("[Y / n] ? ", stdout); }
+		if (mode == MODE_NO) { fputs("[y / N] ? ", stdout); }
+		if (mode == MODE_FORCE) { return 0; }
+	
+		choice = getchar();
+		if (choice == '\n' && mode == MODE_YES) { modechoice = 'Y'; choice = modechoice; goto modeskip;}
+		if (choice == '\n' && mode == MODE_NO) { modechoice = 'N'; choice = modechoice; goto modeskip;}
+		if (choice == '\n' && mode == MODE_NORMAL) { continue; }
+		while ('\n' != getchar());
+
+    } while ( (choice != 'Y') && (choice != 'y') && (choice != 'N') && (choice != 'n') );
+
+    modeskip:
+    if ((choice == 'Y') || (choice == 'y')) {
+        return 0;
+    }
+
+    if ((choice == 'N') || (choice == 'n')) {
+        return 1;
+    }
+
+    return FUNCTION_FAILURE; // Should never happen
+}
+
+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. Do you want to append to it?" << std::endl;
+		int res = choice(0);
+		if(res == 1) {
+			return -1;
+		}
+	}
+
+	out_file_chk.close(); 
+	std::ofstream out_file(argv[2], std::ofstream::app); // 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;
+	}
+}