Recent questions tagged programming - GATE CSE Doubts

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Book: Gate Overflow Question no. 4.7.20 in the Programming in C section

asked 4 days ago in Programming by hadarsh (5 points) | 13 views

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TGA material
Q. What does the following program do when the input is unsigned 16-bit integer? #include<stdio.h> main() { unsigned int num; int i; scanf("%u",&num); for(i=0;i<16;i++) { printf("%d.",(num << i&1 <<15)?1:0 ... it prints all even bits from num (B) it prints all odd bits from num (C) it prints binary equivalent of num (D) none of the above

asked Dec 30, 2020 in Programming by Enolx.21 (25 points) | 9 views

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What would be the output of following program and why?

asked Dec 26, 2020 in Programming by savvysiddharth (5 points) | 29 views

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C- Programming Question on Pointers
What will be the output of the following program? #include "stdio.h" int main() { char a[] = { 'P', 'Q', 'R', 'S' }; char* p = &a[0]; *p++; printf("%c ", *++p); } According to my solution As we know that ... answer comes out to be Q , but when I ran the program, then it showed my R as the output. Can someone please help me with this?

asked Dec 2, 2020 in Programming by Samarth Kejriwal (7 points) | 38 views

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Self Doubt : Bubble Sort
If a question is asked in GATE regarding bubble sort,should i take normal bubble sort or improved version of bubble sort? In some test series question, they are giving best case time complexity as O(n) instead of O(n^2) for bubble sort. So, which one should i take?

asked Nov 26, 2020 in Algorithms by phaneendrababu (23 points) | 19 views

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Made Easy Test
Can someone explain how to find the complexity of this code( in a detailed way)

asked Nov 22, 2020 in Programming by Ashutosh777 (-219 points) | 23 views

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2 Dimensional array and Kth Smallest Element ?
We are given a 2D array [1..M] [1..N] where each row of this matrix is sorted and all elements are distinct. we need to find k-th smallest element on this array. what is the time complexity? O( log n + log m) O(log n log m) O( m ... C is correct and equal to O( m (log m + log n)). but what is the algorithms? is here any details on this time complexity?

asked Nov 21, 2020 in Algorithms by DrMhmd (5 points) | 29 views

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#made-easy-test-series
consider the below function mystery(a,b) { if(a<0 or b<0) return 0; else if (a==0) return b+1; else if(b==0) return mystery(a-1,1); else return mystery(a-1,mystery(a,b-1)); } what would be the value of mystery(3,3)? ans is 61.I am not able to solve it in less time.can someone explain how to solve such type of questions?

asked Nov 17, 2020 in Programming by 404 found (31 points) | 60 views

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#made-easy-test-series
which of the following relationship holds in general between the scope of a variable and the lifetime of a variable(in a language like c)? a)the scope of a variable is contained in the lifetime of the variable b)the scope of a variable is same as the ... c)the scope of a variable is disjoint from the scope of the variable d)none of the above ans is a.can someone explain?

asked Nov 17, 2020 in Programming by 404 found (31 points) | 29 views

+1 vote

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Self doubt:Programming
#include <stdio.h> int main(void) { int b=-1,a=-2; while(+(+b--)!=1){ b-=a++; } printf("%d",b); return 0; } What will be output of this code? I thought output should be 1, but getting no output. Plz tell me why no output here?

asked Nov 13, 2020 in Programming by srestha (1k points) | 48 views

+2 votes

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Made easy self doubt on C programming
Isnt the answer 21?

asked Nov 12, 2020 in Programming by StoneHeart (735 points) | 29 views

+1 vote

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General_Doubt
int main() { int arr[2][3][3]= {'A','B','C','D','E','F','G','H','I','J','K' ,'L','M','N'}; int (*p)[2][3][3]= &arr; printf("%d",(*(*(*p)[0]+5))-(*(*(*p)[1]-3))); } ANS: -1 //F-G here the pointer p is ... pointer as for 3D array it should have been (*p) [3][3] and that is why (*p) is pointing to the whole 3D array not any element of it. Please correct me if i am wrong.

asked Nov 12, 2020 in Programming by Sahil91 (645 points) | 19 views

+2 votes

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NIC Testbook test series
Find the number of times ‘for’ loop runs successfully and the output printed by variable ‘sum’ for the given below code: #include<stdio.h> int x = 14; int fun() { return x--; } int main () { int sum = 0; for(fun();--x;fun()) sum = sum + fun(); printf(‘%d”, sum); return 0; } Options are : 4, 30 5, 26 4, 26 5, 30

asked Nov 9, 2020 in Programming by rsamarth (29 points) | 20 views

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Fork system call self doubt
main() { int a=1, b=2, c=0; c+=a++*++b; print(a,b,c); if(fork()==0) { a+=b+=c+=2; print(a,b,c); c++; } else { b+=c+=a+=3; print(a,b,c); c--; } print(c); } What is the output when this program is executed? Please show the intermediate results also.

asked Nov 7, 2020 in Operating System by Dheera (-22 points) | 32 views

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Self Doubt Algorithms
what is time complexity to insert a node based on key in a priority queue? O(nlogn) O(logn) O(n) (n2) i am unable to get the meaning of the question . is it a simple insertion in the priority queue?? . what is the meaning of “based on key”.Please explain this….

asked Oct 20, 2020 in Programming by manal jain (5 points) | 22 views

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C programming self doubt
int a=14; a=a++; Why is the final output of a is 14 and not 15? Since post operator is used so first the value 14 will be assigned to “a” and then “a” will get incremented to 15.So final value should be 15.But why it is coming output as 14?

asked Oct 19, 2020 in Programming by vishal burnwal (73 points) | 29 views

+1 vote

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Self Doubt Algorithms
I was having a doubt that should we consider = or I am finding different answers on the internet.

asked Oct 17, 2020 in Algorithms by satvik (11 points) | 48 views

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Self Doubt (Call-by-Need)
https://gateoverflow.in/960/gate2003-73 In this question it is said that Call-by-Need works the same way as Call-by-Name with the difference that the evaluation of the parameter reference is done the first time it is encountered in the called function. global int ... will be calculated and saved as 3 and rest of the time x = 3 will only be used producing the output 31 3?

asked Oct 12, 2020 in Programming by Mellophi (363 points) | 22 views

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Following C code why it is correct to use graph->array[i].head and graph->array[i]->head gives error?

asked Sep 25, 2020 in Programming by shashank023 (5 points) | 16 views

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geeksforgeeks
#include <stdio.h> int main() { void demo(); void (*fun)(); fun = demo; (*fun)(); fun(); return 0; } void demo() { printf("GeeksQuiz "); } what will be its output and please explain as well!

asked Sep 22, 2020 in Programming by Setika Mehra (13 points) | 51 views

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p&ds(madeeasy subjectwise test)
In this last statement printf(“ \n %d %d “,s,t ) ; s value should be printed as 2 beacuse in the statement t= p + q+ s++ , s is post incremented so its value is incremented next statement but the sol gives value of s=2. What is the approach ?

asked Sep 22, 2020 in Programming by nitin21038 (2 points) | 36 views

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Geeksforgeeks
You are given a list of 5 integers and these integers are in the range from 1 to 6. There are no duplicates in list. One of the integers is missing in the list. Which of the following expression would give the missing number. ^ is bitwise XOR operator. ~ is bitwise NOT operator. Let elements of list can ... [4] ^ 1 ^ 2 ^ 3 ^ 4 ^ 5 D ~(list[0] ^ list[1] ^ list[2] ^ list[3] ^ list[4])

asked Sep 21, 2020 in Programming by Musa (5 points) | 13 views

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madeeasy topicwise
A 3-ary tree in which every internal node has exactly 3 children. The number of leaf nodes in such a tree with 10 internal nodes will be _____

asked Sep 13, 2020 in Programming by nitin21038 (2 points) | 49 views

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topictest-madeeasy
no of digits in n integer part of logarithm of n base 2 fn always return 0 n/2 the sol is given as b) but I am getting a) as the answer

asked Sep 12, 2020 in Programming by nitin21038 (2 points) | 46 views

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Made easy theory, Self doubt in pointers
#include<stdio.h> int main() { char *p1="Graduate"; char *p2=p1; printf("%c",*++p2); printf("%d",sizeof(p2)); return 0; }

asked Sep 11, 2020 in Programming by sarthakdarji (9 points) | 61 views

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Understanding pointers in C (Yashavant Kanetkar)
Can anyone please provide the output of the below code with proper explanation:- #include <stdio.h> show(int(*q)[3][4],int ii,int jj,int kk){ int i,j,k; int *p; for(i=0;i<ii;i++){ for(j=0;j<jj;j++){ p=q[i][j]; printf("\nThis is %d\n",q[i][ ... 7,8, 9,3,2,1}, { 2,3,5,7, 4,3,9,2, 1,6,3,6} }; show(a, 2, 3,4 ) ; } Thanks in advance.

asked Sep 9, 2020 in Programming by Pratyush Priyam Kuan (1.1k points) | 51 views

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Self doubt:Programming
What will be meaning of printf("%d",--*p); will return? I mean if ‘p’ pointing some address, will --*p decrement on the address or it will decrement the value of that address?

asked Sep 6, 2020 in Programming by srestha (1k points) | 74 views

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Programming :ME
#include<stdio.h> int main(){ int i=500; int *p=&i; foo(&p); printf("%d",*p); return 0; } void foo(int **p1){ int j=2; *p1=&j; printf("%d",**p1); } My doubt what happen when double pointer working as single pointer? *p1=&j in 11th line? Will it work like single pointer? And what will be the output?

asked Sep 6, 2020 in Programming by srestha (1k points) | 49 views

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Self doubt: Programming
#include <stdio.h> int main(void) { char a[20]="GATE 2021"; char *p1; p1=a+2; while((*p1++)&&(*p1!=NULL)){ (*p1)++; } printf("%s",a); return 0; } Will ASCII value of T increment? if not, why not??

asked Sep 5, 2020 in Programming by srestha (1k points) | 60 views

+2 votes

1 answer

Programming:ME
#include<stdio.h> main() { static char *s[]={"madeeasy","online","test”,"series"}; char **ptr[]={s+3,s+2,s+1,s},***p; p=ptr; ++p; printf("%s",*--*++p+3); } What will be printed as output?

asked Aug 31, 2020 in Programming by srestha (1k points) | 65 views

+1 vote

2 answers

Programming doubt:ME
main(){ void fun(); fun(); fun(); } void fun(){ static int i=1; auto int j=5; printf("%d",(i++)); printf("%d",(j++)); } What will be output for this code?

asked Aug 31, 2020 in Programming by srestha (1k points) | 37 views

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Programming :ACE test series
#include <stdio.h> int main(void) { while(1){ if(printf("%d",printf("%c"))) break; else continue; } return 0; } What will be printed here? Isnot garbage value also includes $1$ ?

asked Aug 29, 2020 in Programming by srestha (1k points) | 35 views

+1 vote

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Programming: ACE test
main() { char arr[]="\0"; if(printf("%s\n",arr)) printf("GOOD"); else printf("Nice"); } What will be output? According to online compiler https://ideone.com/ySN4a2 , ans is Nice But according to solution key, ... it prints, as it print a NULL character, it returns 1 and make if statement True. Thus Good printed Which one correct?

asked Aug 28, 2020 in Programming by srestha (1k points) | 48 views

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Array-Programming
#include <stdio.h> int main() { char p; char buf[10] = {1, 2, 3, 4, 5, 6, 9, 8}; p = (buf + 1)[5]; printf("%dn", p); return 0; } what is the output of this code ?

asked Aug 16, 2020 in Programming by val_pro20 (2 points) | 110 views

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1 answer

Timothy williams, Principles of programming languages, enumeration in c

asked Jul 22, 2020 in Programming by Asim Siddiqui 4 (5 points) | 28 views

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GATE undefined section
#include <stdio.h> void main() { int h = 8; int b = h++ + h++ + h++; printf("%d\n", h); } Will this code be considered as undefined as the ‘+’ has no sequence points unlike ‘,’ or we will get some result following the precedence table?

asked Jul 20, 2020 in Programming by abhi_sasuke (5 points) | 24 views

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1 answer

Programming in C
In C, can we declare the variable at the expression 1 of for loop? Why?

asked Jul 17, 2020 in Programming by Richa Agrawal (5 points) | 20 views

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GeeksforGeeks
As per the link https://www.geeksforgeeks.org/data-types-in-c/ if we assume long int takes 8 bytes(64 bits) then its range should be -2^63 to 2^63-1 , but that is not given in the link above. why is it so?

asked Jul 16, 2020 in Programming by Neelam_$ingh_222 (5 points) | 12 views

+1 vote

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Self Doubt:Programming
#include <stdio.h> char str1[100]; char *mystery(char str[]) { static int i = 0; if (*str) { mystery(str+1); str1[i] = *str; i++; } return str1; } int main() { char str[] = "ehT etaG kooB"; printf("%s", mystery(str)); return 0; } Plz execute the code and tell me, how these three line processing here? mystery(str+1); str1[i] = *str; i++;

asked Jul 14, 2020 in Programming by srestha (1k points) | 41 views

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Programming and DS
Can anyone give solution of this C Programming question

asked Jul 13, 2020 in Programming by Richa Agrawal (5 points) | 32 views

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