double averageAge = 0;  
double totalSalary = 0;  
for (int i = 0; i < people.length; i++) {  
	averageAge += people[i].age;  
	totalSalary += people[i].salary;  
}  
averageAge = averageAge / people.length;

• problem
  • 하나의 반복문에 두가지 작업을 한다.
• solution
  • 하나의 반복문에는 하나의 작업을 하도록 반복문을 나눈다.

double averageAge = 0;  
for (int i = 0; i < people.length; i++) {  
	averageAge += people[i].age;  
	totalSalary += people[i].salary;  
}

double totalSalary = 0;  
for (int i = 0; i < people.length; i++) {  
	averageAge += people[i].age;  
	totalSalary += people[i].salary;  
}

averageAge = averageAge / people.length;

reference

https://refactoring.com/catalog/splitLoop.html