GOEDUHUB Tutorials    ||    AI    ||    ML  ||    NLP    ||    OpenCV    ||    Python    ||    OOPS    ||    DBMS    ||    DSA    ||    JAVA    ||    Linux    ||    C Programming
7976731765 Go To Your University       ||       Placement Preparation       ||        Technical-MCQ and Interview Questions
Online Live Classes Youtube Live Link
0 like 0 dislike
39 views
in Tutorial & Interview questions by Goeduhub's Expert (8.1k points)

Setting values in arrays

1 Answer

0 like 0 dislike
by Goeduhub's Expert (8.1k points)
 
Best answer
Accessing array values is generally done through square brackets:

int val;

int array[10];

/* Setting the value of the fifth element to 5: */

array[4] = 5;

/* The above is equal to: */

*(array + 4) = 5;

/* Reading the value of the fifth element: */

val = array[4];

As a side effect of the operands to the + operator being exchangeable (--> commutative law) the following is equivalent:

*(array + 4) = 5;

*(4 + array) = 5;

so as well the next statements are equivalent:

array[4] = 5;

4[array] = 5;                            /* Weird but valid C ... */

and those two as well:

val = array[4];

val = 4[array];                         /* Weird but valid C ... */

C doesn't perform any boundary checks, accessing contents outside of the declared array is undefined (Accessing memory beyond allocated chunk ):

int val;

int array[10];

array[4] = 5;    /* ok */

val = array[4];  /* ok */

array[19] = 20;  /* undefined behavior */

val = array[15]; /* undefined behavior */

 Goeduhub:

About Us | Contact Us || Terms & Conditions | Privacy Policy || Youtube Channel || Telegram Channel © goeduhub.com Social::   |  | 
 Placements:   List of companies | Logical Reasoning Questions | Quantitative Aptitude Questions | General English Questions | Technical-MCQ and Interview Questions
 Important Lists: List of NITsList of IITsList of Exams After Graduation | List of Engineering Entrance Examinations (UG/PG)College ReviewsCollege Fest, Events & WorkshopsKnowledge ShareTrainees/Interns After 15-04-2020
Exams & Cutoffs: JEE Main | JEE Advanced | GATE | IES | ISROList of PSUs || Cutoff-GATECutoff_IIT-JEECS-ScopeECE ScopeEE-Scope
 Download Previous Year Papers For:  GATE | IES | RAJASTHAN TECHNICAL UNIVERSITY (RTU-Kota)RPSC Technical Exams | ISRO
...