関連ワード:  write a program using for loop in c    write a program using nested for loop in c    write a program using while loop in c++    write a program using for loop to calculate the average of first n natural numbers    write a program using do while loop in c++    write a program using goto statement in c    write a program using switch statement in c++    write a program using if statement in c    write a program using break statement in c    write a program using continue statement in c