import java.util.*
 
fun main() {
    // 1. 루프 횟수를 입력받고, 입력 오류 시 1을 기본값으로 설정 (val 사용)
    print("몇 번 계산하시겠습니까? (횟수 입력): ")
    val num: Int = readLine()?.toIntOrNull() ?: 1
 
    // 2. 불필요한 var i를 제거하고 for 루프 사용
    for (i in 1..num) {
        print("첫 번째 숫자 입력: ")
        // 3. 입력이 없거나 변환 실패 시 0을 기본값으로 설정 (널 안전성 확보)
        val a: Int = readLine()?.toIntOrNull() ?: 0
 
        print("두 번째 숫자 입력: ")
        val b: Int = readLine()?.toIntOrNull() ?: 0
 
        // 결과 출력
        println("결과: ${a + b}")
    }
}

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