ICS 103: Computer Programming in C
Handout4 Topic:
Arithmetic Expressions.
Objective:
•
To know about basic data types of C.
•
To know about difference in /
and % operators.
•
To know how to change type of variable at any place using type
casting
.
•
To Know rules for Evaluation of Arithmetic Expression.
•
To know how to use
+=
, =, *= , /= , %=
compound assignment statements.
•
To know how to write mathematical formula in C.
Data Types in C:
Basic data types in C language
are int, char, float and double.
Data Type
Bytes required for
storing it in computer
memory.
Placeholder / Conversion
specifier required with scanf or
printf .
int
2
%d
char
1
%c
float
4
%f
double
8
%lf
long int
4
%ld
long double
10
%Lf
Arithmetic Expressions:
Use of / (Division Operator) and % (Mod Operator or Remainder Operator) :
When an integer is divided by another integer the result is always an integer even
if the answer consists of fractional value. For example
5 / 2
gives the answer as
2
though the actual answer is
2.5
because integer cannot have fraction.
To avoid this inconsistency we use conversion operation called a
cast
.
Placing the name of the desired data type in parentheses
immediately before
the
value to be converted causes the value to be changed to the desired data format
before it is used in computation
. So, to get the correct answer for the previous
case of
5 / 2
we write
(double) 5 / (double) 2
or
(float) 5 / (float) 2
. We can also
write
(double) 5 /
2
or
(float) 5 / 2
because changing one operand will
automatically change the other operand
.
This causes the value of the answer to
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this casting does not change 5 and 2 to float or double, they will
remain as integers only.
Similarly, to find the remainder
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 Spring '10
 zaman
 Algebra, Expression

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