~cpp 
//LoveCalculator 

#include <stdio.h>
#include <string.h>

void get_names(char *first_person, char *second_person);
void calculator(char *first_person, char *second_person);
int sum_name(char name[25]);

void main()
{
	char first_person[30]; 
	char second_person[30]; 
	char ch;
	while((ch = getchar()) != EOF)
	{
		ungetc(ch, stdin);
		get_names(first_person, second_person);
		calculator(first_person, second_person);
	}
}

void get_names(char *first_person, char *second_person)
{
	gets(first_person);
	gets(second_person);
	if(strlen(first_person) > 25 || strlen(second_person) > 25)
	{
		get_names(first_person, second_person);
	}
}

void calculator(char *first_person, char *second_person)
{
	int first_person_sum, second_person_sum;
	float percentage;
	
	first_person_sum = sum_name(first_person);
	second_person_sum = sum_name(second_person);

	while(first_person_sum >= 10)
	{
		first_person_sum = (first_person_sum % 10) + (first_person_sum % 100) / 10 + (first_person_sum / 100);
		 // 수정한 부분..
	}
	while(second_person_sum >= 10)
	{
		second_person_sum = (second_person_sum % 10) + (second_person_sum % 100) / 10 + (first_person_sum / 100);
	}
	
	if(first_person_sum < second_person_sum)
	{
		percentage = (float)first_person_sum/second_person_sum;
	}else{
		percentage = (float)second_person_sum/first_person_sum;
	}
	percentage *= 100; 
	// result print
	printf("%.2f", percentage);
	printf(" %% \n");
}

int sum_name(char name[25])
{
	int sum = 0, i = 0;
	while(name[i] > 0)
	{
		if(name[i] >= 65 && name[i] <= 90)
		{
			sum = sum + name[i] - 64;
		}else if(name[i] >= 97 && name[i] <= 122)
		{
			sum = sum + name[i] - 96;
		}else{}
		++i;
	}
	return sum;
}