Computer Programming: C language Subject Teacher: Shamshad Lakho shamshad.lakho@gmail.com Lecture – 12 & 13

Prompt the user to enter an integer in inverted commas. #include<stdio.h> #include<conio.h> int main() { int a; printf(" \"Enter an integer\" "); scanf("%d",&a); getch(); }

Expressions Expression consists of two things: Operands It specifies an entity on which an operation is to be performed. Operators It specifies the operation to be applied to its operands.

Simple Expression and Compound Expression An Expression has only one operator called Simple expression eg: a+2 An Expression has more than one operator called Compound Expression. eg: b=2+3*5

Operators An operator is a symbol that tells the computer to perform certain mathematical or logical manipulations Classification of Operators: Number of operands on which an operator operates The role of an operator Classification based on Number of operands Unary- it operates on only one operand Eg: &, sizeof operator, !, ~, ++, -- Binary – it operates on two operands eg: *, /, <<, ==,&&, & Ternary- it operates on three operands eg: ?:

Classification based on Role of Operator Arithmetic Operators +, -, *, /, % Relational Operators <, <=, >, >=, ==, != Logical Operators &&, ||, ! Assignment Operators = Increment and Decrement Operators ++,-- Conditional Operators ?= Special Operators ,, sizeof, &, * ., ->

Arithmetic Operators C Operation Algebraic C Addition (+) f + 7 Subtraction (-) p – c Multiplication (*) bm b * m Division (/) x / y Modulus (%) r mod s r % s

Expressions Arithmetic Expressions An expression is a combination of variables constants and operators written according to the syntax of C language. Algebraic Expression C Expression a x b – c a * b – c (m + n) (x + y) (m + n) * (x + y) 3x2 +2x + 1 3*x*x+2*x+1

Assignment Write a C program that read two integers from the keyboard and store the value entered in the variable a & b and display their sum. Write a C program that read an integer value from the keyboard and display its square. Write a C program that read a value of Temperature in Celsius from the keyboard and display its equivalent Temperature in Fahrenheit. Write a C program that read a value of Temperature in Fahrenheit from the keyboard and display its equivalent Temperature in Celcius.