This slide describe the arithmetic operators used in C programming language. www.learnbywatch.com

1. C Programming
Language
By:
Yogendra Pal
yogendra@learnbywatch.com
Dedicated to My mother and Father

2. t
y
Keep your notebook with you.
Write important point and questions that comes in your mind
Solve Mind band exercise.
C
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THIS IS ARITHMETIC INSTRUCTIONS
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3. What do you know?
• printf() function?
• scanf() function?
• How to write a simple C program?
• How to compile and run it?
• If answers are yes then you can go ahead.
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4. Problem
• Write a program to add two numbers. These
numbers must input by user.
• For addition (+) we need arithmetic operators.
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5. Arithmetic Operators
• * : multiplication y z
2 4
• / : division
• + : addition
• - : subtraction 2+4
x
• % : modulus operator 6
• Variable = constant;
– x = y + z;
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6. Result of each operator
• 2*3=6
• 4/2=2
• 4+2=6
• 4–2=2
• 4%3=1
• 4%2=0
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7. Some Constraints
• Arithmetic operators act on numeric values.
– (int/float/char) operator (int/float/char)
– character represents numeric (ASCII) value.
• Modules operator works only when
– int % int (non-zero).
• Division operator works only when
– (int/float/char) / (non-zero value).
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8. You must know
• int / int = int
• (int / float) = float
• (float / int) = float
• (float / float) = float
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9. Assignment Operator =
• Assign expression value to an identifier.
• identifier = expression or variable = constant.
• If both operand are of different data types
then right side value convert into the data
type of left side identifier.
• Multiple assignment execute from right to left.
– x = y = z = 5.
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10. More Assignment Operator…
• *=, /=, %=, +=, -= know as compound
assignment operator.
• x += 1; means x = x + 1;
• a -= b; means a = a – b;
• m %= (n-7); means m = m % (n-7);
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11. Addition of two numbers
start start
#include<stdio.h>
#include<conio.h>
Define a,b,c int a,b,c
void main()
initialize b,c b = 4, c = 2 {
int a, b, c;
a=b+c a=b+c b = 4;
c = 2;
print a print a a = b + c;
printf(“%d”,a);
getch();
stop stop }
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12. Unary Operators
• Operate upon single operand.
• - (unary minus)
• + (unary plus)
• -- (decrement operator) : decrement by 1
– i--; or --i; equal to i = i -1;
• ++ (increment operator) : increment by 1
– i++; or ++i; equal to i = i +1;
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13. Unary Operator…
• sizeof : returns the size (bytes) of operand.
– printf(“integer: %d”,sizeof(i));
• Type Cast is also a unary operator.
• Type Cast changes the data type of operand.
– (Type) operand;
– float a = 3.7;
– (int)a;
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14. Operator precedence
Operator Operation Precendence
() Parentheses Evaluate First,
Innermost first,
Left to right.
-, +, --, ++, Unary operators Right to left
sizeof, (type)
*, / or % Multiplication, Division or Left to right.
modulus
+ or - Addition and subtraction Left to right.
= Assignment (Multiple) Right to left.
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15. Example of precedence
• a=2*3/4+4/4+8–2+5/ (3+1)
• a=2*3/4+4/4+8–2+5/ 4
• a=6/4+4/4+8–2+5/ 4
• a=1+4/4+8–2+5/ 4
• a=1+1+8–2+5/ 4
• a=1+1+8–2+1
• a=2+8–2+1
• a = 10 – 2 + 1
• a=8+1
• a=9
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16. Mind Bend
• Calculate the value.
– ( 3 * 5.9 – 2 * 6 ) % ( 4 * 8 + 4 )
–2*((8/6)+(4*(9–4))%(3*2–2)
– ( 3 * 9 - 3 ) % ( 5 + 3 * 3) / ( 6 - 7 )
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17. Calculate the average
start start
Define a,b,c Define a,b,c
initialize b,c initialize b,c
a=b+c/2 a=(b+c)/2
print a print a
stop stop
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18. Problem
• Write a program to convert a value from
kilometer to meter.
• Formula to convert km in to meter is:
– 1 km = 1000 m so,
– n km = 1000 * n m
• Now you can solve any formula based
problem.
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19. Problem…
• Write a program that convert a lowercase
character to uppercase character.
• Write a program to calculate the area and
circumference of the circle.
• Two numbers (x and y) are entered through the
keyboard. Write a program to interchange the
value of x and y.
• Write a program that print reverse of a 5 digit
given number.
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20. Problem…
• Write a program that calculate the root of a
quadratic equation.
– ax2 + bx + c = 0.
• Input marks of five subjects of a student and
write a program to calculate and print addition
and percentage of that student.
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21. Mind Bend
• Write a program that convert a uppercase
alphabet to lowercase alphabet.
• Write a program to calculate the area and
perimeter of rectangle.
• Write a program that print reverse of a 3 digit
given number.
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22. To get complete benefit of this tutorial solve all the quiz on
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yogendra@learnbywatch.com
with the subject “C”
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NEXT IS DECISION CONTROL
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