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Recent questions tagged undefined-behaviour

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Self Doubt [Sequence point]
from Dennis Ritchie “a[i] = i++ The question is whether the subscript is the old value of i or the new value “ My doubt: we already know ‘ ++ ’ has higher precedence than ‘ = ’.S as it is post increment value of i will be incremented after use hence it should be like a[i] = i; i++; How it creates ambiguity...i iran it on compiler and ran as i mentioned

jatin khachane 1 asked in Programming in C Dec 16, 2018

by jatin khachane 1

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2 answers

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Gate CS
#include<stdio.h> int main() { int x, y = 7; x = ++y + ++y + y--; printf("%d\n", x); return 0; } What is the output of this code snippet ? A. 27 B. 26 C. 25 D. Compilation error

Abhisek Saha asked in Programming in C Aug 31, 2018

by Abhisek Saha

644 views

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1 answer

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What is output of following program
It is not any gate question but just my doubt over the topic C programming? Ques:- What will be the output of the following program? void main(){ int a=0,x=0; a = 10; x = ++a + ++a + ++a; printf("Value of X = ... } What will be the output of the above program? Please give explanation also for your answer. (Please tell what was your approach in this answer)

kislaya Pant asked in Programming in C Jun 17, 2018

by kislaya Pant

1.4k views

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2 answers

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UGC NET CSE | June 2009 | Part 2 | Question: 15
What is the value of $‘b’$ after the execution of the following code statements : $C=10;$ $B=++c + ++c;$ $20$ $22$ $23$ None

rishu_darkshadow asked in Programming in C Sep 22, 2017

by rishu_darkshadow

1.7k views

8 votes

1 answer

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float vs double
Program 1: #include<stdio.h> int main() { float x = 0.1; if (x == 0.1) printf("IF"); else if (x == 0.1f) printf("ELSE IF"); else printf("ELSE"); } The output of above program is ELSE IF . Program ... getting these weird output and is there any way to predict these outputs on the same processor. Also how comparison is done of two variables in C ?

ManojK asked in Programming in C Mar 10, 2017

by ManojK

5.6k views

1 vote

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Sequence Points in C and Undefined Behaviour
What are sequence Points ....? A sequence point defines any point in a computer program's execution at which it is guaranteed that all side effects of previous evaluations will have been performed, and no side effects from subsequent evaluations have yet been ... statement ? If so explain how it is done printf("%d , %d , %d ",i++,i,++i);

PEKKA asked in Programming in C Nov 18, 2016

by PEKKA

592 views

1 vote

2 answers

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Sanjay Sharma asked in Programming in C Nov 17, 2016

by Sanjay Sharma

859 views

0 votes

1 answer

8

c program
#include<stdio.h> int main() { char *p1="xyz"; char *p2="xyz"; if(p1==p2) printf("equal"); else printf("unequal"); } Output is equal how??? please explain

Ankush Tiwari asked in Programming in C Aug 20, 2016

by Ankush Tiwari

467 views

1 vote

1 answer

9

What is the Output?
#include<stdio.h> int main() { int a = 10, b = 20, c = 30, d = 40; printf("%d%d%d",a, b, c); printf("%d%d%d", d); return 0; } What is the Output and when I run it I am getting some wierd answer. Please explain ?

Prajwal Bhat asked in Programming in C Aug 19, 2016

by Prajwal Bhat

1.1k views

2 votes

1 answer

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c program
#include<stdio.h> #include<stdlib.h> int main() { int p=9; printf("%d %d",p++,++p); } how it executed and also how printf function executed left to right or right to left?

Registered user 7 asked in Programming in C Aug 19, 2016

by Registered user 7

542 views

1 vote

1 answer

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C Program
#include<stdio.h> #define CUBE(x) (x*x*x) int main() { int a, b=3; a = CUBE(b++); printf("%d, %d ", a, b); return 0; } Why this give 27,6 as output?

komal07 asked in Programming in C Aug 18, 2016

1.0k views

21 votes

1 answer

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Undefined Behaviour in C
What will be the output of the following code? #include<stdio.h> int main() { int x=10, y; y = (x++) + (++x); printf("%d %d %d %d ", y, x++, x, ++x); } 22,10,11,13 22,11,11,11 12,10,11,13 22 13 13 13

Arjun asked in Programming in C Aug 8, 2016

by Arjun

8.1k views

13 votes

8 answers

13

ISRO2015-69
If n has 3, then the statement a[++n]=n++; assigns 3 to a[5] assigns 4 to a[5] assigns 4 to a[4] what is assigned is compiler dependent

milankamilya asked in Programming in C Jun 14, 2016

by milankamilya

8.5k views

0 votes

4 answers

14

If a= 10 then what will be the value of b in a C language code
If a= 10 then what will be the value of b in a C language code . If b= a++ + a++ + a++; . 30. 23. 33. Undefined behaviour

Sanjay Sharma asked in Programming in C Jun 7, 2016

by Sanjay Sharma

1.9k views

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