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#include <iostream>
#include < string.h >
using namespace std;
	//_CRT_SECURE_NO_WARNINGS
	//3. Пользователь вводит 2 имени файла, программа копирует 
	//только те строки из первого файла во второй, которые содержат гласные буквы
 
	void main()
	{
		char s[80];
		cout << "enter first file name: " << endl;
		cin.getline(s, 80);
		FILE* file1 = fopen(strcat(s, ".txt"), "w");
		if (file1 != nullptr)
		{
			fputs("hello world", file1);
			fputs("\n123", file1);
			fputs("\nqwt", file1);
			fclose(file1);
		}
		else
		{
			cout << "Error opening file!" << endl;
		}
 
		file1 = fopen(s, "r");
 
 
		char s2[80];
		cout << "enter second file name: " << endl;
		cin.getline(s2, 80);
		FILE* file2 = fopen(strcat(s2, ".txt"), "w");
 
		if (file1 != nullptr && file2 != nullptr)
		{
			char buffer1[80];
			while (!feof(file1))
			{
 
				strcpy(buffer1, "");
				fgets(buffer1, 80, file1);
				int length, i, j;
				char	kol[80];
				char vowel[] = "AEIOUYaeiouy";
				length = strlen(buffer1);
				for (j = 0; j <= 5; j++) 
				{
					for (i = 0; i <= length; i++)
						if (buffer1[i] == vowel[j])//сравниваем введённые элементы с заданными значениями строки
							fputs(buffer1, file2);
				}
				fclose(file1);
				fclose(file2);
 
 
 
			}
		}
		else
		{
			cout << "Error opening file!" << endl;
		}
 
	}
 
 
 
 
 
 
 
 

Main.java:1: error: illegal character: '#'
#include <iostream>
^
Main.java:1: error: class, interface, or enum expected
#include <iostream>
         ^
Main.java:2: error: illegal character: '#'
#include < string.h >
^
Main.java:8: error: class, interface, or enum expected
	void main()
	^
Main.java:11: error: class, interface, or enum expected
		cout << "enter first file name: " << endl;
		^
Main.java:12: error: class, interface, or enum expected
		cin.getline(s, 80);
		^
Main.java:13: error: class, interface, or enum expected
		FILE* file1 = fopen(strcat(s, ".txt"), "w");
		^
Main.java:14: error: class, interface, or enum expected
		if (file1 != nullptr)
		^
Main.java:17: error: class, interface, or enum expected
			fputs("\n123", file1);
			^
Main.java:18: error: class, interface, or enum expected
			fputs("\nqwt", file1);
			^
Main.java:19: error: class, interface, or enum expected
			fclose(file1);
			^
Main.java:20: error: class, interface, or enum expected
		}
		^
Main.java:24: error: class, interface, or enum expected
		}
		^
Main.java:29: error: class, interface, or enum expected
		char s2[80];
		^
Main.java:30: error: class, interface, or enum expected
		cout << "enter second file name: " << endl;
		^
Main.java:31: error: class, interface, or enum expected
		cin.getline(s2, 80);
		^
Main.java:32: error: class, interface, or enum expected
		FILE* file2 = fopen(strcat(s2, ".txt"), "w");
		^
Main.java:34: error: class, interface, or enum expected
		if (file1 != nullptr && file2 != nullptr)
		^
Main.java:37: error: class, interface, or enum expected
			while (!feof(file1))
			^
Main.java:41: error: class, interface, or enum expected
				fgets(buffer1, 80, file1);
				^
Main.java:42: error: class, interface, or enum expected
				int length, i, j;
				^
Main.java:43: error: class, interface, or enum expected
				char	kol[80];
				^
Main.java:44: error: class, interface, or enum expected
				char vowel[] = "AEIOUYaeiouy";
				^
Main.java:45: error: class, interface, or enum expected
				length = strlen(buffer1);
				^
Main.java:46: error: class, interface, or enum expected
				for (j = 0; j <= 5; j++) 
				^
Main.java:46: error: class, interface, or enum expected
				for (j = 0; j <= 5; j++) 
				            ^
Main.java:46: error: class, interface, or enum expected
				for (j = 0; j <= 5; j++) 
				                    ^
Main.java:48: error: class, interface, or enum expected
					for (i = 0; i <= length; i++)
					            ^
Main.java:48: error: class, interface, or enum expected
					for (i = 0; i <= length; i++)
					                         ^
Main.java:51: error: class, interface, or enum expected
				}
				^
Main.java:53: error: class, interface, or enum expected
				fclose(file2);
				^
Main.java:57: error: class, interface, or enum expected
			}
			^
Main.java:62: error: class, interface, or enum expected
		}
		^
33 errors

Standard output is empty