This is a powerpoint presentation that discusses on building simple C program with program sample and programming exercises

1. BUILDING SIMPLE C PROGRAM
ED 714: COMPUTER PROGRAMMING AND SYSTEM DESIGN
SESSION 3
JERALD P. CEJAS
Content Sharer

2. OPENING PRAYER

3. OPENING PRAYER

4. CLOSING PRAYER

5. CLOSING PRAYER

6. I. OBJECTIVES

7. I. OBJECTIVES
 Define input and output in C;
 Encode and run simple sample of
input/output programs;
 Build simple C program

8. II. DOCUMENTATION

9. II. DOCUMENTATION
 https://www.scaler.com/topics/c/input-and-output-
functions-in-c/
 https://www.programiz.com/c-programming/c-input-
output
 https://study.com/academy/lesson/basic-input-
output-in-c-programming.html

10. III. CONTENT OUTLINE

11. III. CONTENT OUTLINE
Building Simple C Program
 Input/Output
 Sample Programs
 Programming Exercises

12. INTRODUCTION

13. IV. THE REPORT
4.1 INTRODUCTION
What will be your answer if I ask you what is an algorithm?
Then you may reply that it is a step-by-step procedure over a set of
instructions that provide us with the desired Output. Then my cross-
question will be, "Desired Output for what?" Again it is easy, “Output for an
Input”. So this means most of the algorithms/programs take an Input to
perform a step-by-step procedure to provide the desired Output.

14. Input is given through the keyboard, and output may be shown
on screen or printed through the printer or in another way. Still, for the
different devices, there may be a different type of process for input/output,
which may be a problem for the programmer. To avoid this, all input/output
are done using streams in C, which handles input/output without taking care
of where input is coming and the destination of the output. It can be added
to any C program by introducing a Standard Input/Output library using
stdio.h header.

15. Stream is the sequence of bytes of data in the form of a
sequence of characters. While taking input, we get a sequence of
characters entering into our program, that is, the input stream and for
output, we send a sequence of characters out from our program, which is
the output stream. The main advantage of the stream is it makes
input/output programming independent of the device.

16. What is input in C?

17. Have you visited ATMs? If yes, you know ATM is an Electronic Banking
outlet that provides transactions to the users based on some set of instructions.
Still, for every user, it requires some details like a PIN, which means most
algorithms have some set of instructions but need some external data/information
to work over it. Input refers to the process of feeding data into the program. Data
can be in a command line or from a file. Random Access Memory is kept by the C
program while executing. When data come from an external location to the
program, it is moved to RAM where the program can access it and that external
data is known as input.
INPUT/ OUTPUT IN C
What is input in C?

18. What is output
in C?

19. Let's continue our ATM story so that when users provide PINs and other required
inputs, the ATM, after performing all the instructions, provides cash, bank details, or other
desired stuff, which means the algorithm, after performing on the input, provides the
desired results. Still, it may be in different ways, like the output on screen or a print
through a printer or in another way. Output refers to sending data out of the program or
simply sending data to the location out of the program memory. The destination of the
data may be a screen, printer, or Disk. For getting output, it is not always compulsory to
have an input, like an algorithm for generating random numbers will simply return random
numbers without any input.
INPUT/ OUTPUT IN C
What is output in C?

20. How to take input &
output of basic types
in C?

21. We have some input and output functions in C, let's look over them:
INPUT
For taking input in C, we use the built-in function of the C scanf(). scanf() method
reads the input from standard input stream stdin and scans that input as per the
type specified.
Syntax of taking input in C
How to take input and output of basic types in C?

22. Syntax of taking input in C
The above syntax is for taking input from the user. Where %A defines format
specifier in C, it helps the compiler identify the data type of variable for which we
will take input, and '&' is the address operator in C. It helps the compiler change
the actual value of this variable stored at this address in the memory.

23. We have some input and output functions in C, let's look over them:
OUTPUT
For display output to the user in C, we are using the built-in function of C printf().
printf() method writes the output to the standard output stream stdout and prints
the value passed as the parameter to it.
Syntax of taking output in C
How to take input and output of basic types in C?

24. Syntax of taking output in C
The above syntax for displays output to the user. Where %A defines format
specifier in C, it helps the compiler identify the data type of variable we are going
to output.
The basic type of input and output in C includes data types of variables like int,
float, char, etc. The A in the above syntax is replaced with the appropriate format
specifier of that type

25. Format specifier for different data types
Data Type value of A
int %d
float %f
char %c
long %l or %ld
double %lf

26. Syntax of input and output of basic data types in C

27. Example
Output
The above code takes the inputs for
variables of a type character, integer,
and float using scanf and then outputs
them using printf() with the help of
proper format specifiers.

28. SAMPLE
PROGRAM

29. SAMPLE PROGRAM
Example 1: Integer Input/Output
Output
Enter an integer: 4
Number = 4
Here, we have used %d format
specifier inside the scanf()
function to take int input from the
user. When the user enters an
integer, it is stored in the testInteger
variable.

30. SAMPLE PROGRAM
Example 2: Float and Double Input/Output
Output
Enter a number: 12.523
Enter another number: 10.2
num1 = 12.523000
num2 = 10.200000

31. SAMPLE PROGRAM
Example 3: C Character Input/Output
Output
Enter a character = g
You entered g

32. SAMPLE PROGRAM
Example 4: https://www.youtube.com/watch?v=hgYnQW5znjE

33. SAMPLE PROGRAM
Example 5: https://www.youtube.com/watch?v=17gp5DJEyiw&list=PL98qAXLA
6aftD9ZlnjpLhdQAOFI8xIB6e

34. PROGRAMMING
EXERCISES

35. PROGRAMMING EXERCISES
Exercise 1: Write a program in C that calculate the sum of three numbers with
getting input in one line separated by a comma.
#include <stdio.h>
int main()
{
int a,b,c,d;
printf("Please enter any three numbers separated by a comma:");
scanf("%d, %d, %d", &a, &b, &c);
d = a + b + c;
printf("The sum of three number is: %d", d);
return 0;
}

36. PROGRAMMING EXERCISES
Exercise 2: Write a C program to perform addition, subtraction, multiplication and
division of two numbers.
#include <stdio.h>
int main()
{
int a,b,c,d,e,f;
printf("Please enter any two numbers separated by a comma:");
scanf("%d, %d,", &a, &b);
c = a + b;
d = a - b;
e = a * b;
f = a / b;
printf("The sum of two numbers is: %dn", c);
printf("The difference of two numbers is: %dn",d);
printf("The product of two number is: %dn", e);
printf("The quotient of two number is: %dn", f);
return 0;
}

37. PROGRAMMING EXERCISES
Exercise 3: Write a C program that prints the perimeter and area of a rectangle to
take its height and width as input.

38. jerald.cejas@ctu.edu.ph
Zig Ziglar