[C++]c++创建txt文件，文件名为输入的字符串，求字节数

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#include <iostream>
using namespace std;

int main() {
    char filename[255];
    cin >> filename;

    FILE * pFile = fopen(filename, "r");
    fseek(pFile, 0L, SEEK_END);
    long count = ftell(pFile);  
    cout << "字节数=" << count << endl;
    fclose(pFile);
    return 0;
}