関連ワード:  write a c program using functions    write a c program using function to generate the fibonacci series    write a c program using function to find the factorial of a number    write a c program using function to swap two numbers    write a c program using function to perform multiplication of two matrices    write a c program using function to find area of circle    write a c program using function to swap the values of two variables    write a c program using functions to count the frequency of each digit in a number    write a c program using function to exchange two numbers using pointers