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int main(int argc, char *argv[])
{
	setlocale(LC_ALL, "Russian");
	char str[550] = " ";
	char res[500] = " ";
	char out[500] = " ";
	int j = 0, i = 0;
	int k = 0;
	char str2[1000] = " ";
	/*FILE *fp, *f_out;*/
	int c;
	FILE *fp = fopen("in.txt", "r"), *f_out = fopen("out.txt", "w");
	int l = 0;
 
	fgets(str, 550, fp);
 
		for (k = 0; k < strlen(str); k++)
		{
			if (str[k] == ' ')  //probel
			{
				if (j == 0) continue;
				if (str[k + 1] == ' ')
					continue;
			}
			res[j] = str[k];
			j++;
 
			//абзаци
			if (*(str + i) == '\t' && *(str + i + 1) == '\t')
			{
				int q = i;
				while (q < strlen(str))
				{
					*(str + q) = *(str + q + 1);
					q++;
				}
			}
			//одинаковые символы
			if (*(str + i) == *(str + i + 1))
			{
				int q = i;
				while (q < strlen(str))
				{
					*(str + q) = *(str + q + 1);
					q++;
				}
			}
			else
			{
				*(res + i) = *(str + i);
				i++;
			}
		}
 
	printf("%s", res);
	fprintf(f_out, "%s", res);
	fclose(fp);
	fclose(f_out);
 
	system("pause");
	/**************************************/
	return 0;
}

prog.cpp: In function 'int main(int, char**)':
prog.cpp:3:12: error: 'LC_ALL' was not declared in this scope
  setlocale(LC_ALL, "Russian");
            ^
prog.cpp:3:29: error: 'setlocale' was not declared in this scope
  setlocale(LC_ALL, "Russian");
                             ^
prog.cpp:12:2: error: 'FILE' was not declared in this scope
  FILE *fp = fopen("in.txt", "r"), *f_out = fopen("out.txt", "w");
  ^
prog.cpp:12:8: error: 'fp' was not declared in this scope
  FILE *fp = fopen("in.txt", "r"), *f_out = fopen("out.txt", "w");
        ^
prog.cpp:12:32: error: 'fopen' was not declared in this scope
  FILE *fp = fopen("in.txt", "r"), *f_out = fopen("out.txt", "w");
                                ^
prog.cpp:12:36: error: 'f_out' was not declared in this scope
  FILE *fp = fopen("in.txt", "r"), *f_out = fopen("out.txt", "w");
                                    ^
prog.cpp:15:20: error: 'fgets' was not declared in this scope
  fgets(str, 550, fp);
                    ^
prog.cpp:17:29: error: 'strlen' was not declared in this scope
   for (k = 0; k < strlen(str); k++)
                             ^
prog.cpp:55:18: error: 'printf' was not declared in this scope
  printf("%s", res);
                  ^
prog.cpp:56:26: error: 'fprintf' was not declared in this scope
  fprintf(f_out, "%s", res);
                          ^
prog.cpp:57:11: error: 'fclose' was not declared in this scope
  fclose(fp);
           ^
prog.cpp:60:16: error: 'system' was not declared in this scope
  system("pause");
                ^

Standard output is empty