Add new file

exception.h

+#ifndef LABORATORY_WORK_1_2_EXCEPTIONS_H
+#define LABORATORY_WORK_1_2_EXCEPTIONS_H
+
+
+#include <exception>
+#include <string>
+
+
+class BadFileFormatException : public std::exception {
+    std::string error;
+public:
+    BadFileFormatException() {
+        error.assign("Unknown or unsupported file format!");
+    }
+    explicit BadFileFormatException(const std::string& file_format) {
+        error.assign("File format \"" + file_format + "\" is not supported!");
+    }
+    const char* what() const noexcept override {
+        return error.c_str();
+    }
+};
+
+class NoFileFoundException : public std::exception {
+    std::string error;
+public:
+    NoFileFoundException() {
+        error.assign("Cannot open file! Probably it does not exist!");
+    }
+    explicit NoFileFoundException(const std::string& file_) {
+        error.assign("Cannot open file: \"" + file_ + "\"! Probably it does not exist!");
+    }
+    const char* what() const noexcept override {
+        return error.c_str();
+    }
+};
+
+#endif