c++ 循环创建不同名的txt

while(!boudary_backup.empty()){char szName[50] = {'\0'}; sprintf(szName, "line/line%d.txt", index); std::ofstream linesFile( szName );index++;MyPoint beginPoint, nextPoint;beginPoint.x = boudary_backup.front().x;beginPoint.y = boudary_backup.front().y;linesFile << beginPoint.x << " " << beginPoint.y << std::endl;boudary_backup.erase(boudary_backup.begin());while (HaveNeighbor(beginPoint, nextPoint)){beginPoint = nextPoint;linesFile << beginPoint.x << " " << beginPoint.y << std::endl;}}