CHAPTER 4

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DATA INPUT AND
OUTPUT
1

• Define input output statements
• Explain function of input output
2
statements
• Create and modify input output
fil...

4
C Environment

C environment
input device output device
5
error device
stdin
stdout
stderr

input/output operation take places as a stream
of character
#include<stdio.h> includes the contents of
standard input-o...

 C provides standard functions, scanf() and
printf() for performing formatted input and
output
 Input data may contai...

 printf() and puts()
printf() function
used for formatted output to standard output
device that is screen
general for...

9
Codes Meaning
b Back space
f Form feed
n New line
r Carriage return
t Horizontal tab
” Double quote mark
’ Singl...

puts()
to display a string contained in a string
variable
general form:
e.g:
char str[20]=“I am going to England”;
p...

 scanf() and gets()
scanf() function
used for formatted input from standard input
device that is keyboard
general for...

gets()
to accept string up to a new line character into
a string variable
general form:
12
char*gets (char *);

 To illustrate gets() and puts()
13
#include<stdio.h>
#include<conio.h>
void main()
{
char words[40];
clrscr();
p...

14
printf() STATEMENT OUTPUT
printf(“Line 1”);
printf(“Line 2”);
Line1Line2Line3
printf(“Line 3”);
The newline chara...

 Specifies the field in which the data has to
be entered
15
code meaning
%c Single character
%d Decimal integer
%e ...

 int d;
to accept a value into a variable n of int type
scanf(“%d”,&n); Which is %d is the format specifier for int
16...

 float f;
to accept a floating point value into the variable f
scanf(“%f”, &f); Note that the format specified used is ...

 int d;
To display the value of the variable n of int type
printf(“%d”,n); Which is %d is the format specifier for int ...

 float f;
to display the floating point value stored in the
variable f
printf(“%f”,f); Note that the format specified ...

 To illustrate simple printf() and scanf()
Enter first number : 15
Enter second number :65
Total for first and second ...

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