C Programming PDF - Tata Elxsi

CC –Programming Programming Learning and Development Tuesday, November 3, 2020 1 Expressions Day -1 and operators 2 Expressions An expression consists of at least one operand and zero or more operators. Operands are objects...

CC –Programming Programming Learning and Development Tuesday, November 3, 2020 1 Expressions Day -1 and operators 2 Expressions An expression consists of at least one operand and zero or more operators. Operands are objects such as constants, variables, and function calls that return values. 47 2+2 cosine(3.14159) Parentheses group subexpressions: ( 2 * ( ( 3 + 10 ) - ( 2 * 6 ) ) ) 3 Operators There are three categories of operators in C. - Unary operators - Binary Operators - Ternary Operators 4 Types of operators Unary : [ + - ! ~ ++ - - (type)* & sizeof ] Arithmetic Operators : [ * , / , + , - ] Relational Operators: [ ,==,!=,= ] Logical Operators [ &&,||,! ] Bitwise Operators [ >,^,&,|, ] Ternary or Conditional Operators: [ ?: ] Assignment Operator : [ = += -= *= /= %=>>= y Less than < Is operand 1 less than operand 2? x= Is operand 1 greater than or equal to operand 2? x>=y to Less than or equal to Is operand 1 greater than operand 2? x>y Less than < Is operand 1 less than operand 2? x= Is operand 1 greater than or equal to operand 2? x>=y to Less than or equal to 1 = %d\n", x >> 3); //3 = 31 / 9 return 0; } 26 Precedence and Order of Evaluation Operators Associativity () [] ->. left to right ! ~ ++ -- +(u) -(u) *(u) sizeof() right to left */% left to right +- left to right > left to right < >= left to right == != left to right &,^,| left to right && , || left to right ?: right to left = += -= *= /= %= &= ^= |= = right to left 27 Type cast  Type cast is to explicitly cause an expression to be of a specified data type.  A type cast consists of a type specifier enclosed in parentheses, followed by an expression.  To ensure proper casting, you should also enclose the expression that follows the type specifier in parentheses. - float x; - int y = 7; - int z = 3; - x = (float) (y / z); 28 statement  We write statements to cause actions and to control flow within programs.  You can also write statements that do not do anything at all, or do things that are uselessly trivial.  iTotal = 100 + 200; While(1){ ; } 29 Expression Statements  Expressions can be turned into a statement by adding a semicolon to the end of the expression. - 5; - 2 + 2; - 10 >= 9;  Expression statements are only useful when they have some kind of side effect, such as storing a value, calling a function, or (this is esoteric) causing a fault in the program. - x++; - y = x + 25; - puts ("Hello, world"); - *iPtr; 30 Thank you Thank You Learning & Development, Tata Elxsi, Bangalore. ITPB Road Whitefield Bangalore 560 048 India [email protected] www.tataelxsi.com Confidentiality Notice This document and all information contained herein is the sole property of Tata Elxsi Limited and shall not be reproduced or disclosed to a third party without the express written consent of Tata Elxsi Limited. 31