Frequently Asked C Interview Question Answers by the Recruiters

Frequently Asked C Interview Question Answers by the Recruiters Frequently Asked C Interview Questions Answers6 min read Read ­ing Time: 4 min ­utesBefore direct ­ly going to the, C Inter ­view Ques ­tions and answers, you need to have a faint idea of what C lan ­guage is. Sec ­ond ­ly, you should know how to write the codes for a giv ­en prob ­lem. The C pro ­gram ­ming lan ­guage is basi ­cal ­ly used in the devel ­op ­ment of sys ­tem appli ­ca ­tions that major ­ly con ­tributes to oper ­at ­ing sys ­tems. The oper ­at ­ing sys ­tem not nec ­es ­sar ­i ­ly has to be Win ­dows, instead, it could be Unix and Lin ­ux as well. The lan ­guage in which UNIX appli ­ca ­tions along with Oper ­at ­ing sys ­tems and C com ­pil ­er is being writ ­ten is called C lan ­guage. With this, you can pro ­ceed with the C Inter ­view Ques ­tions, but, start from the very basic. Make sure, you have good the ­o ­ret ­i ­cal knowl ­edge along with prac ­ti ­cal imple ­men ­ta ­tion. The first ques ­tion in the series of C Inter ­view Ques ­tions is as fol ­lows. Read these Python Inter ­view Ques ­tions blog that will qual ­i ­fy you for Python Inter ­views with the most pos ­si ­ble ques ­tions you are going to be asked in 2020. Name the different storage class specifiers in C? To answer this ques ­tion, one should not take that much of time and prompt ­ly answer that the stor ­age class spec ­i ­fiers in C are auto, reg ­is ­ter, sta ­t ­ic and extern. What do you know about the NULL pointer? You should start by telling that NULL POINTER does not point to any object or func ­tion. A devel ­op ­er ini ­tial ­izes point ­ers as a NULL POINTER only if they are not aware of their val ­ue at the time of being declared. But, a point ­er is actu ­al ­ly NULL at the time when mem ­o ­ry is being point ­ed by its deal ­lo ­ca ­tion amidst the pro ­gram. Explain what is a Dangling pointer Dan ­gling Point ­ers do not point to an actu ­al mem ­o ­ry loca ­tion. These point ­ers appear when an object is delet ­ed or deal ­lo ­cat ­ed, with ­out mod ­i ­fy ­ing the val ­ue of the point ­er. What is a memory leak? A mem ­o ­ry leak occurs when pro ­gram ­mers pro ­duce a mem ­o ­ry in heap and ignore to delete it. Mem ­o ­ry leaks are seri ­ous prob ­lems for pro ­grams such as dae ­mons and servers which by def ­i ­n ­i ­tion nev ­er stop. Could you explain Modular Programming? Mod ­u ­lar Pro ­gram ­ming is noth ­ing but a divi ­sion of pro ­grams into sub-pro ­grams or sub-mod ­ules or sub-func ­tions. This sub ­di ­vi ­sion helps in achiev ­ing the giv ­en task and is a mod ­u ­lar approach. Gener ­ic func ­tion def ­i ­n ­i ­tion gives the abil ­i ­ty to re-use the func ­tions, like built-in library func ­tions. You could read more ques ­tions like that so that you could pre ­pare your ­self for the C Inter ­view Ques ­tions that are the ­o ­ry-based. How ­ev ­er, prac ­ti ­cal knowl ­edge and prac ­ti ­cal imple ­men ­ta ­tion are equal ­ly impor ­tant. You should know how to place your codes accord ­ing to the giv ­en query because you are step ­ping in the world of codes. Differentiate Source Codes from Object Codes Source codes are the codes that were addressed by the pro ­gram ­mer. They are made up of the com ­mands and oth ­er key ­words that instruct the com ­put ­er about what to do. How ­ev ­er, com ­put ­ers do not under ­stand source codes. Con ­se ­quent ­ly, source codes are assem ­bled using a com ­pil ­er. The result ­ing out ­puts become object codes, which are in a for ­mat that the com ­put ­er proces ­sor under ­stands. What is a dynamic data structure? A dynam ­ic data struc ­ture pro ­duces a sys ­tem for col ­lect ­ing data more effi ­cient ­ly into mem ­o ­ry. When dynam ­ic mem ­o ­ry allo ­cat ­ing works, it helps a pro ­gram in access ­ing mem ­o ­ry spaces as and when need ­ed. Can we use the “if” function for distinguishing strings? The “if” com ­mand can only be uti ­lized to exam ­ine numer ­i ­cal val ­ues as well as sin ­gle char ­ac ­ter val ­ues. To dis ­tin ­guish string val ­ues, there is a dif ­fer ­ent func ­tion called str ­cmp that deals espe ­cial ­ly with strings. When do we prefer a “switch” statement over an “if” statement? The switch state ­ment is best prac ­ticed when work ­ing with selec ­tions based on an indi ­vid ­ual vari ­able or expres ­sion. How ­ev ­er, switch state ­ments can only esti ­mate inte ­ger as well as char ­ac ­ter data types. How are Function prototypes declared in C Language? A func ­tion in C lan ­guage is declared as: return_type function_name(formal para ­me ­ter list) { Function_Body; } Can a program be compiled without the main() function? Yes, the com ­pi ­la ­tion is pos ­si ­ble, but the exe ­cu ­tion is not pos ­si ­ble. How ­ev ­er, if you use #define, we can exe ­cute the pro ­gram with ­out the need for main(). For instance: #include stdio.h #define start main void start() { printf(“Hi”); } Write a loop statement that will show the following output: 1 12 123 1234 12345 This is a lit ­tle com ­plex process but you could start one by one so that you could exe ­cute the pro ­gram eas ­i ­ly. for (a=1; alt;=5; i++) { for (b=1; blt;=a; b++) printf(quot;%dquot;,b); printf(quot; quot;); } Write a simple code fragment that will check if a number is positive or negative. The code If (numgt;=0) printf(quot;number is pos ­i ­tivequot;); else printf (quot;num ­ber is neg ­a ­tivequot;); Write down a sim ­ple code frag ­ment that will swap the val ­ues of two vari ­ables num1 and num2. The code is as fol ­lows: int temp; temp = num1; num1 = num2; num2 = temp; How to display the ASCII value of the uppercase character ‘A’ using the concept of implicit type conversion? The cod ­ing for the same is as fol ­lows. #includestdio.h int main() { char char ­ac ­ter = ‘A’; int num ­ber = 0, val ­ue; val ­ue = char ­ac ­ter + num ­ber; printf(“The ASCII val ­ue of A is: %d ”,value); return 0; Find the length of a string without using the inbuilt function strlen(). #include stdio.h int main() { printf(“Welcome to DataFlair tutorials! ”); char String[50]; int count; printf(“Enter a string: ”); scanf(“%s”, String); for(count = 0; String[count] != ‘’; count++); printf(“The length of string: %d ”, count); return 0; } Write a code snippet that changes a floating point number to an integer with the help of casting. float f = 1.0; int i1 = (int) f; int i2 = * (int *) f; printf(“%d , i1); printf(“%d , i2); These ques ­tions are real ­ly sig ­nif ­i ­cant and can be asked at an inter ­view. While you are prepar ­ing for c inter ­view ques ­tions pro ­grams, make sure you go through the above ques ­tions so that you could get a hint of how to tack ­le and deal with a query that is placed as a ques ­tion in front of you. No mat ­ter how good you are on the the ­o ­ret ­i ­cal part, you can not just ignore the cod ­ing struc ­ture. Being a devel ­op ­er, you should have prop ­er knowl ­edge of syn ­tax. As a result, the inter ­view ­er will judge you upon your prac ­ti ­cal skills along with the the ­o ­ret ­i ­cal knowl ­edge. In addi ­tion to that, you should revise your chap ­ters dai ­ly so that you could pre ­pare your ­self in a bet ­ter way and be in prac ­tice so that you do not face anx ­i ­ety while answer ­ing the inter ­view ­er. There are more scopes for C lan ­guage in the future, so young ­sters should go for it with ­out any sec ­ond thought. Mas ­ter ­ing this lan ­guage will open more oppor ­tu ­ni ­ties for you and revis ­ing the c inter ­view ques ­tions will enhance the chances of a com ­pa ­ny hir ­ing you and giv ­ing you the oppor ­tu ­ni ­ty to use your knowl ­edge of C lan ­guage effi ­cient ­ly. In oth ­er words, you should try to bring out the best in you in terms of plac ­ing the cod ­ings. Relat ­ed Post: Best MVC Inter ­view Ques ­tions for Sure Shot Selec ­tion Relat ­ed Post: Sele ­ni ­um Inter ­view Ques ­tions that you Can’t-Miss to Pre ­pare c interview questionsc interview questions answerstop c interview questions and answers