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#include<stdio.h>
#include<string.h>
int main()
{
	//문자열로 이진수 입력받기
	char input[1000001] = { 0x00, };
	gets(input);
	int len = strlen(input);
	//printf("%d", len);
	int num = 0x00;
	int input2[350000] = { 0x00, };
	int len2 = 0x00;
	int j = 0;
	int i = len - 1;
    //3자리씩 끊어서 배열에 저장
	while (1) {
		num = input[i] - 48;
        input2[j]+=num;
		i--;
		if (i < 0) break;
		num = input[i] - 48;
		num *= 2;
		input2[j] += num;
		i--;
		if (i < 0) break;
		num = input[i] - 48;
		num *= 4;
		input2[j] += num;
		i--;
 
		if (i < 0) break;
        j++;
	}
    //8진수로 출력하기
	len2 = strlen(input2);
	for (int k = len2 - 1; k >= 0; k--) {
		printf("%d", input2[k]);
	}
}

prog.cpp: In function ‘int main()’:
prog.cpp:7:2: error: ‘gets’ was not declared in this scope
  gets(input);
  ^~~~
prog.cpp:7:2: note: suggested alternative: ‘fgets’
  gets(input);
  ^~~~
  fgets
prog.cpp:35:16: error: cannot convert ‘int*’ to ‘const char*’
  len2 = strlen(input2);
                ^~~~~~
In file included from prog.cpp:2:
/usr/include/string.h:384:35: note:   initializing argument 1 of ‘size_t strlen(const char*)’
 extern size_t strlen (const char *__s)
                       ~~~~~~~~~~~~^~~

Standard output is empty