C programming

Precedence and associativity

Operator Precedence: This determines the order in which operators are evaluated in an expression. Operators with higher precedence are evaluated before operators with lower precedence. For example, in the expression 2 + 3 * 4, the multiplication (*) has higher precedence than addition (+), so 3 * 4 is evaluated first, resulting in 12, and then 2 + 12 is evaluated, resulting in 14.

Associativity: When operators have the same precedence, associativity determines the order in which they are evaluated. For example, the + operator is left-associative, so in the expression 2 + 3 + 4, the leftmost + is evaluated first, resulting in 5, and then 5 + 4 is evaluated, resulting in 9.

Program:

                            #include <stdio.h>

int main() {
    int a = 10, b = 5, c = 2, result;

    result = a * b + c;  // Multiplication has higher precedence than addition
    printf("Result 1: %d\n", result);  // Output: 52

    result = a + b * c;  // Multiplication has higher precedence than addition
    printf("Result 2: %d\n", result);  // Output: 20

    result = (a + b) * c;  // Parentheses can be used to change the order of evaluation
    printf("Result 3: %d\n", result);  // Output: 30

    result = a / b * c;  // Division has the same precedence as multiplication, left associativity
    printf("Result 4: %d\n", result);  // Output: 4

    result = a + b / c;  // Division has the same precedence as addition, left associativity
    printf("Result 5: %d\n", result);  // Output: 12

    result = a / (b * c);  // Parentheses can be used to change the order of evaluation
    printf("Result 6: %d\n", result);  // Output: 2

    return 0;
}

In this example, the expressions are evaluated according to operator precedence and associativity rules, demonstrating different results based on how the expressions are written.

Resources :

Test Your Knowledge

Choose The

With supporting text below as a natural lead-in to additional content.

Q1. A variable name can have ?

A. Any special symbol

B. Blank space

C. Comma ( , )

D. Underscore

Q2. Which pair of symbols is used to define the scope of functions, loops, and other code blocks in C?

A. ( )

B. { }

C. [ ]

D. < >

Getting Started With C

Precedence and associativity

Resources :

Choose The