【C言語】
関数名や変数名に漢字を使うと？いいかも

#include <stdio.h>
long 生涯所得(
    long 時給,
    long 勤務時間,
    long 勤務日数,
    long 勤務年数
)
{
    return 時給 * 勤務時間 * 勤務日数 * 12 * 勤務年数;
}
int main(void)
{
    int     時給        = 1000 ;
    int     勤務時間    = 8 ;
    int     勤務日数    = 20 ;
    int     勤務年数    = 40 ;
    printf("生涯所得 = %ld\n",
        生涯所得(
            時給,
            勤務時間,
            勤務日数,
            勤務年数
        )
    );
}

#include <stdio.h>
long lifetime_income(
    long hourly_rate, 
    long hours_worked, 
    long working_days, 
    long years_of_service)
{
    return hourly_rate * hours_worked * working_days * 12 * years_of_service ; 
}
int main(void)
{
    int hourly_rate = 1000 ;
    int hours_worked = 8 ;
    int working_days = 20 ;
    int years_of_service = 40 ;
    printf("lifetime income = %ld\n",
        lifetime_income(
            hourly_rate,
            hours_worked,
            working_days,
            years_of_service
        )
    );
}