The document discusses the basics of C programming language including compiling and running a C program, the structure of a C program, and basic C programming concepts like variables, data types, input/output functions, and conditional and looping statements. It provides examples of simple C programs to calculate the sum and area of shapes, and to input and output a date. The key functions discussed are printf() for output, scanf() for input, and getchar() to read a character. Basic C program elements like preprocessing directives, main function, and data types are also covered.

1. C

2. Topic
o Language
program
o Compile & Run
program
o Structure of C
program
o

3. •
•
Language)
(Low-Level
(Machine
language)
(MiddleLevel Language)
(Assembly Language)
(High-Level
Language)
Pascal, Fortran, C,
JAVA, …

4. 1.
(Machine Language)
•
2 (0/1)
o
o
Object Code

5. (Assembly Language)
•
2
o
o
(
)

6. 6

7. •
Languages)
–
(High-Level
C, JAVA,
Interpreter
(Compiler)
• Compiler
(
Pascal, C, ...)
• Interpreter

8. Compile
•
•
Source code (file)
C
Machine code (Object file)
C

9. Compile & Run
C
•
main)
•
C
(
Edit

10. C
• Preprocessor Directive
(
• Main Function (
1
Void main()
2
{
3
statements;
5
•
)
Programming
#include<stdio.h>
2
void main()
3
{
4
5
End
}
1
n
/* main function */
/ Begin (
)
variable declaration;
4
)
printf("C Programmingn");
}
cursor
C
/* Preprocessor directive*/

11. C
•
4
C
1.
Statements)
2.
Statements)
3.
Statements)
4.
Statements)
•
(Input / Output
(Expression
(Conditioning
(Looping
int x, y
float

12. • printf (
stdio)
C
Memory
stdio
Preprocessor Directive
o
printf
main
•
printf(“control string”,
variable,…);
 control string
o
printf(“C
o variable
(
Programming”); )
%d
integer
decimal %f
Memory
o %format
%d, %f, %c, %s
real
o
variable
o
n (new line), …
floating point

13. 
Programming
C

14. Memory
variable
(X)
• scanf (
stdio.h)
•
…
Address
0
1
2 (&X)
3
4
…
scanf(“%format,…”,
&variable,…);
o %format
o &variable
%d, %f, %c,
%s (Address)
scanf(“%d”, &X);
variable
integer
%d
integer
decimal %f
real
floating point
X
&X

15. 
2
(X, Y)
(Sum)
Memory
start
X
Y
Input X,Y
#include<stdio.h>
SUM
void main()
{
int X, Y, SUM;
printf("Enter X:"); scanf("%d", &X);
SUM = X+Y
printf("Enter Y:"); scanf("%d", &Y);
Print SUM
SUM = X+Y;
printf("Sum = %dn", SUM);
end
}
printf
(Output)
o scanf
C
o
C
(Input)
50
100
150

16. % format
• %format
scanf, printf
(integer)
(real)
%format
int
%d
float
%f
#include<stdio.h>
void main()
{
int X, Y, sum;
printf("Enter X:"); scanf("%d",&X);
printf("Enter Y:"); scanf("%d",&Y);
sum = X+Y
printf("sum = %dn", sum);
}
Memory
X
Y
SUM

17. 3
W
Area
L

(Area)
Width x Length (
#include<stdio.h>
x
Area =
)
start
Input W,L
void main()
Area = W*L
{
int W,L;
float Area;
printf("Enter width:");
scanf("%d", &W);
printf("Enter length:");
scanf("%d", &L);
Area = W*L;
printf("Area = %fn", Area);
}
Print Area
end
Enter width: 5
_
Enter length: 10
_
Area = 50.0

18. 4
1
2
3
4
5
6
7
8
9
10
11
12
1

(
#include<stdio.h>
)
start
Input Feet
F
void main()
Inches = Feet*12
{
int F,Inches;
Print Inches
printf("Enter feet:");
scanf("%d", &W);
end
inches = F*12;
printf("=%d inchesn", Inches);
}
Memory
2
Enter feet: _
= 24 inches
Inches

19. getchar, gets
• scanf
“%format
o
•
 getchar()
ENTER
Character
 getch()
ENTER
Library “stdio”
Library “conio”

20. (Day),

(Year)
November, 2013
Month day, year (
1, 2013 )
#include<stdio.h>
void main()
1,
(Month),
Memory
November
Day
Year
Month
{
int Day, Year;
1
2013
N
o
v
e
m
b
e
r
char Month[20];//string
printf("Enter Day:");scanf("%d",&Day);
printf("Enter Month:");scanf("%s",&Month);
printf("Enter Year:");scanf("%d",&Year);
1
Enter Day: _
printf("Date is %s %d,%dn",Month, Day, Year);
Enter Month: November
_
fflush(stdin);getchar();
2013
Enter Year: _
}
Date is November 1, 2013
Keyboard