This code prints out Pascal's triangle by calculating factorials. It takes in a number of rows from the user, then uses nested for loops to calculate and print the binomial coefficients for each row. The main function calls scanf to get the number of rows, then has an outer for loop from 0 to the input number of rows. An inner for loop calculates and prints each term by dividing the factorial of the current row number by the factorial of the current term number and row number minus the term number. It calls a factorial function that uses a for loop to calculate the factorial of a given integer.