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- #include <cassert>
- #include <fstream>
- #include <iostream>
- #include <string>
- #include <string_view>
- using namespace std;
- // реализуйте эту функцию:
- size_t GetFileSize(string file) {
- ifstream in(file, ios::in);
- if (in) {
- in.seekg(0, ios::end);
- return static_cast<size_t>(in.tellg());
- }
- return string::npos;
- }
- int main() {
- ofstream("test.txt") << "123456789"sv;
- assert(GetFileSize("test.txt"s) == 9);
- ofstream test2("test2.txt"s);
- test2.seekp(1000);
- test2 << "abc"sv;
- test2.flush();
- assert(GetFileSize("test2.txt"s) == 1003);
- assert(GetFileSize("a file not exists"s) == string::npos);
- }
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