Answered: Describe a situation where the add…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Describe a situation where the add operator in a programming language
would not be commutative.

____________________________________________________________________

Let the function fun be defined as
int fun(int *k) {
*k += 4;
return 3 * (*k) – 1;
}
Suppose fun is used in a program as follows:
void main(){
int i = 10, j = 10, sum1, sum2;
sum1 = (i/2) + fun(&i);
sum2 = fun(&j) + (j/2);
}
What are the values of sum1 and sum2
a. if the operands in the expressions are evaluated left to the right?
b. if the operands in the expressions are evaluated right to the left?

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