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4.main(){ int i,j; long int f=1; for (i=1, i< 10; i++) f=f*i; } prinf(“%ld",f);}

4.main(){ int i,j; long int f=1; for (i=1, i< 10; i++) f=f*i; } prinf(“%ld",f);}

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Comment each C statement in C program and write output .

```c main() { int i, j; long int f = 1; for (i = 1; i < 10; i++) f = f * i; } printf("%ld", f); } ``` The program above is written in the C programming language. It calculates the factorial of the number 9 (9!) and prints the result. ### Explanation: - **Variables:** - `int i, j;`: Declares two integer variables, `i` and `j`. - `long int f = 1;`: Declares a long integer variable `f` and initializes it to 1. - **For Loop:** - `for (i = 1; i < 10; i++)`: Starts the for loop with `i` initialized to 1. The loop will continue as long as `i` is less than 10, and `i` is incremented by 1 in each iteration. - `f = f * i;`: Multiplies `f` by `i` in each iteration, calculating the factorial step by step. - **Output:** - `printf("%ld", f);`: Prints the calculated factorial using the `printf` function, with `%ld` indicating a long integer format. ### Note: - **Factorial Calculation:** The loop calculates 9! (9 factorial) which is `9 x 8 x 7 x ... x 1`. - **j Variable:** The variable `j` is declared but unused in this program.
Transcribed Image Text:```c main() { int i, j; long int f = 1; for (i = 1; i < 10; i++) f = f * i; } printf("%ld", f); } ``` The program above is written in the C programming language. It calculates the factorial of the number 9 (9!) and prints the result. ### Explanation: - **Variables:** - `int i, j;`: Declares two integer variables, `i` and `j`. - `long int f = 1;`: Declares a long integer variable `f` and initializes it to 1. - **For Loop:** - `for (i = 1; i < 10; i++)`: Starts the for loop with `i` initialized to 1. The loop will continue as long as `i` is less than 10, and `i` is incremented by 1 in each iteration. - `f = f * i;`: Multiplies `f` by `i` in each iteration, calculating the factorial step by step. - **Output:** - `printf("%ld", f);`: Prints the calculated factorial using the `printf` function, with `%ld` indicating a long integer format. ### Note: - **Factorial Calculation:** The loop calculates 9! (9 factorial) which is `9 x 8 x 7 x ... x 1`. - **j Variable:** The variable `j` is declared but unused in this program.
Expert Solution
Step 1
Factorial Program in C: Factorial of n is the product of all positive descending integers. 
Factorial of n is denoted by n!

Here, 5! is pronounced as "5 factorial", it is also called "5 bang" or "5 shriek".

The factorial is normally used in Combinations and Permutations (mathematics).

There are many ways to write the factorial program in c language. Let's see the 2 ways to write the factorial program.

  • Factorial Program using loop
  • Factorial Program using recursion
  •  

This program takes a positive integer from the user and computes the factorial using for loop.

 

 
 

Since the factorial of a number may be very large, the type of factorial variable is declared as unsigned long long.

If the user enters a negative number, the program displays a custom error message.


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