1. Chapter 3: I/O Management

2. printf() and scanf() function
printf() and scanf() function are used as basic I/O function.
printf syntax:
printf(string, expression1, expression2, ……)
No limit on number of value can be that can be printed
Format string may contain ordinary character and conversion specification begin with %
Conversion specifier specifies compiler to convert into specific format.
Though compiler doesn’t check the conversion specification number should match.

3. Why following printf() is wrong
printf(“%d %d”, i);
printf(“ %d”, i, j);
int i;
float x;
printf(“%f %d\n”,i,x);

4. Conversion Specifier d  deimal e  floating point is exponential
f  Display floating point number
c  character
s  string
%.1f  display float value with one digit decimal
%4d  display with space in front (Right justification)
%-4d  display with space in back (Left Justification)

5. Example

6. Escape Sequence Non printing character having special meaning
Start with \
Some common escape sequence are

7. The scanf() function Takes input from user, Syntax
scanf(“string ”, &variable, &variable, ………..)
Never FORGET to use & before variable
Confusing printf() and scanf() …

8. Input fraction

9. Thank you