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This logic seems correct but its not working . Is there any mistake? [duplicate]

Using a for loop to reverse an array does nothingWhy use pointers?Constructor initialization-list evaluation orderWhy are elementwise additions much faster in separate loops than in a combined loop?Passing a 2D array to a C++ functionmerge sort incorrect outputHow to detect a Christmas Tree?Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviationsPercent of correct answers program challengeC++ arrays and functions, code not working outI have written a code to find reverse of array elements but it doesnot gives required output

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0

1

This question already has an answer here:

• 
  Using a for loop to reverse an array does nothing [duplicate]
  
  1 answer
  
  

The program is to reverse the contents of an array .
For example if the array contained 1,2,3,4,5
it should display 5,4,3,2,1

for(i=0;i<n;i++)

 tmp=a[i];
 a[i]=a[n-1-i];
 a[n-1-i]=tmp;

c++

share|improve this question

edited Mar 28 at 9:55

Jabberwocky

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asked Mar 28 at 9:53

PizzaLover1134PizzaLover1134

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Mar 28 at 10:02

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  If you look closely, this loop reverses twice resulting in the original array.
  
  – Wander3r
  Mar 28 at 9:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  after this if i use another for loop and print the array... I am getting 1,2,3,4,5
  
  – PizzaLover1134
  Mar 28 at 9:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  can you please explain further?
  
  – PizzaLover1134
  Mar 28 at 9:56
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @Targeryen take a piece of paper and a pencil and you should be able to figure out yourself what's wrong with your approach
  
  – Jabberwocky
  Mar 28 at 9:56
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @suvenpandey You don't have to post your own answer as a comment.
  
  – CinCout
  Mar 28 at 10:03
  

  
  
  
  

 | 
show 2 more comments

0

1

This question already has an answer here:

• 
  Using a for loop to reverse an array does nothing [duplicate]
  
  1 answer
  
  

The program is to reverse the contents of an array .
For example if the array contained 1,2,3,4,5
it should display 5,4,3,2,1

for(i=0;i<n;i++)

 tmp=a[i];
 a[i]=a[n-1-i];
 a[n-1-i]=tmp;

c++

share|improve this question

edited Mar 28 at 9:55

Jabberwocky

29.9k1010 gold badges4343 silver badges8080 bronze badges

asked Mar 28 at 9:53

PizzaLover1134PizzaLover1134

944 bronze badges

marked as duplicate by StoryTeller, YSC c++
Users with the  c++ badge can single-handedly close c++ questions as duplicates and reopen them as needed.

StackExchange.ready(function()
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Mar 28 at 10:02

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  If you look closely, this loop reverses twice resulting in the original array.
  
  – Wander3r
  Mar 28 at 9:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  after this if i use another for loop and print the array... I am getting 1,2,3,4,5
  
  – PizzaLover1134
  Mar 28 at 9:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  can you please explain further?
  
  – PizzaLover1134
  Mar 28 at 9:56
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @Targeryen take a piece of paper and a pencil and you should be able to figure out yourself what's wrong with your approach
  
  – Jabberwocky
  Mar 28 at 9:56
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @suvenpandey You don't have to post your own answer as a comment.
  
  – CinCout
  Mar 28 at 10:03
  

  
  
  
  

 | 
show 2 more comments

This question already has an answer here:

• 
  Using a for loop to reverse an array does nothing [duplicate]
  
  1 answer
  
  

The program is to reverse the contents of an array .
For example if the array contained 1,2,3,4,5
it should display 5,4,3,2,1

for(i=0;i<n;i++)

 tmp=a[i];
 a[i]=a[n-1-i];
 a[n-1-i]=tmp;

c++

share|improve this question

edited Mar 28 at 9:55

Jabberwocky

29.9k1010 gold badges4343 silver badges8080 bronze badges

asked Mar 28 at 9:53

PizzaLover1134PizzaLover1134

944 bronze badges

for(i=0;i<n;i++)

 tmp=a[i];
 a[i]=a[n-1-i];
 a[n-1-i]=tmp;

share|improve this question

edited Mar 28 at 9:55

Jabberwocky

29.9k1010 gold badges4343 silver badges8080 bronze badges

asked Mar 28 at 9:53

PizzaLover1134PizzaLover1134

944 bronze badges

share|improve this question

edited Mar 28 at 9:55

Jabberwocky

29.9k1010 gold badges4343 silver badges8080 bronze badges

asked Mar 28 at 9:53

PizzaLover1134PizzaLover1134

944 bronze badges

edited Mar 28 at 9:55

Jabberwocky

29.9k1010 gold badges4343 silver badges8080 bronze badges

edited Mar 28 at 9:55

Jabberwocky

29.9k1010 gold badges4343 silver badges8080 bronze badges

asked Mar 28 at 9:53

PizzaLover1134PizzaLover1134

944 bronze badges

asked Mar 28 at 9:53

PizzaLover1134PizzaLover1134

944 bronze badges

4 Answers
4

active

oldest

votes

5

To reverse an array you dont iterate over entire array. That would lead to reversing array twice.
Try for(i=0;i<n/2;i++)

share|improve this answer

answered Mar 28 at 9:55

Suven PandeySuven Pandey

68833 silver badges1616 bronze badges

add a comment
 | 

0

You can reverse like this

for (int i = 0; i < n--; i++)

 tmp = a[i];
 a[i] = a[n];
 a[n] = tmp;

share|improve this answer

answered Mar 28 at 10:04

Deb SDeb S

41544 silver badges1313 bronze badges

add a comment
 | 

-1

You are reversing the array in-place, hence after the first step you have the first and the last element in its correct position. After iterating over half the elements you have the first half and the second half in its corret position. Now, iterating over all elements, you swap each element twice which results in the original array.

share|improve this answer

answered Mar 28 at 9:59

formerlyknownas_463035818formerlyknownas_463035818

24.6k44 gold badges3232 silver badges8282 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for explaining further
  
  – PizzaLover1134
  Mar 28 at 10:01
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  seems like someone is on a voting spree, if you know what is wrong would be cool to let me know
  
  – formerlyknownas_463035818
  Mar 28 at 10:03
  

  
  
  
  

add a comment
 | 

-1

int i = 0, j = n - 1;
for (i = 0; i < n/ 2; i++, j--)

 int temp = array[i];
 array[i] = array[j];
 array[j] = temp;

share|improve this answer

answered Mar 28 at 10:00

Nitesh AgarwalNitesh Agarwal

344 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Although this code might (or might not) solve the problem, a good questions should also explain why this code helps and how it solves the problem.
  
  – BDL
  Mar 28 at 10:28
  

  
  
  
  

add a comment
 | 

5

To reverse an array you dont iterate over entire array. That would lead to reversing array twice.
Try for(i=0;i<n/2;i++)

share|improve this answer

answered Mar 28 at 9:55

Suven PandeySuven Pandey

68833 silver badges1616 bronze badges

add a comment
 | 

5

To reverse an array you dont iterate over entire array. That would lead to reversing array twice.
Try for(i=0;i<n/2;i++)

share|improve this answer

answered Mar 28 at 9:55

Suven PandeySuven Pandey

68833 silver badges1616 bronze badges

add a comment
 | 

To reverse an array you dont iterate over entire array. That would lead to reversing array twice.
Try for(i=0;i<n/2;i++)

share|improve this answer

answered Mar 28 at 9:55

Suven PandeySuven Pandey

68833 silver badges1616 bronze badges

share|improve this answer

answered Mar 28 at 9:55

Suven PandeySuven Pandey

68833 silver badges1616 bronze badges

answered Mar 28 at 9:55

Suven PandeySuven Pandey

68833 silver badges1616 bronze badges

answered Mar 28 at 9:55

Suven PandeySuven Pandey

68833 silver badges1616 bronze badges

0

You can reverse like this

for (int i = 0; i < n--; i++)

 tmp = a[i];
 a[i] = a[n];
 a[n] = tmp;

share|improve this answer

answered Mar 28 at 10:04

Deb SDeb S

41544 silver badges1313 bronze badges

add a comment
 | 

0

You can reverse like this

for (int i = 0; i < n--; i++)

 tmp = a[i];
 a[i] = a[n];
 a[n] = tmp;

share|improve this answer

answered Mar 28 at 10:04

Deb SDeb S

41544 silver badges1313 bronze badges

add a comment
 | 

You can reverse like this

for (int i = 0; i < n--; i++)

 tmp = a[i];
 a[i] = a[n];
 a[n] = tmp;

share|improve this answer

answered Mar 28 at 10:04

Deb SDeb S

41544 silver badges1313 bronze badges

for (int i = 0; i < n--; i++)

 tmp = a[i];
 a[i] = a[n];
 a[n] = tmp;

share|improve this answer

answered Mar 28 at 10:04

Deb SDeb S

41544 silver badges1313 bronze badges

answered Mar 28 at 10:04

Deb SDeb S

41544 silver badges1313 bronze badges

answered Mar 28 at 10:04

Deb SDeb S

41544 silver badges1313 bronze badges

-1

You are reversing the array in-place, hence after the first step you have the first and the last element in its correct position. After iterating over half the elements you have the first half and the second half in its corret position. Now, iterating over all elements, you swap each element twice which results in the original array.

share|improve this answer

answered Mar 28 at 9:59

formerlyknownas_463035818formerlyknownas_463035818

24.6k44 gold badges3232 silver badges8282 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for explaining further
  
  – PizzaLover1134
  Mar 28 at 10:01
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  seems like someone is on a voting spree, if you know what is wrong would be cool to let me know
  
  – formerlyknownas_463035818
  Mar 28 at 10:03
  

  
  
  
  

add a comment
 | 

-1

You are reversing the array in-place, hence after the first step you have the first and the last element in its correct position. After iterating over half the elements you have the first half and the second half in its corret position. Now, iterating over all elements, you swap each element twice which results in the original array.

share|improve this answer

answered Mar 28 at 9:59

formerlyknownas_463035818formerlyknownas_463035818

24.6k44 gold badges3232 silver badges8282 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you for explaining further
  
  – PizzaLover1134
  Mar 28 at 10:01
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  seems like someone is on a voting spree, if you know what is wrong would be cool to let me know
  
  – formerlyknownas_463035818
  Mar 28 at 10:03
  

  
  
  
  

add a comment
 | 

You are reversing the array in-place, hence after the first step you have the first and the last element in its correct position. After iterating over half the elements you have the first half and the second half in its corret position. Now, iterating over all elements, you swap each element twice which results in the original array.

share|improve this answer

answered Mar 28 at 9:59

formerlyknownas_463035818formerlyknownas_463035818

24.6k44 gold badges3232 silver badges8282 bronze badges

share|improve this answer

answered Mar 28 at 9:59

formerlyknownas_463035818formerlyknownas_463035818

24.6k44 gold badges3232 silver badges8282 bronze badges

answered Mar 28 at 9:59

formerlyknownas_463035818formerlyknownas_463035818

24.6k44 gold badges3232 silver badges8282 bronze badges

answered Mar 28 at 9:59

formerlyknownas_463035818formerlyknownas_463035818

24.6k44 gold badges3232 silver badges8282 bronze badges

-1

int i = 0, j = n - 1;
for (i = 0; i < n/ 2; i++, j--)

 int temp = array[i];
 array[i] = array[j];
 array[j] = temp;

share|improve this answer

answered Mar 28 at 10:00

Nitesh AgarwalNitesh Agarwal

344 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Although this code might (or might not) solve the problem, a good questions should also explain why this code helps and how it solves the problem.
  
  – BDL
  Mar 28 at 10:28
  

  
  
  
  

add a comment
 | 

-1

int i = 0, j = n - 1;
for (i = 0; i < n/ 2; i++, j--)

 int temp = array[i];
 array[i] = array[j];
 array[j] = temp;

share|improve this answer

answered Mar 28 at 10:00

Nitesh AgarwalNitesh Agarwal

344 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Although this code might (or might not) solve the problem, a good questions should also explain why this code helps and how it solves the problem.
  
  – BDL
  Mar 28 at 10:28
  

  
  
  
  

add a comment
 | 

int i = 0, j = n - 1;
for (i = 0; i < n/ 2; i++, j--)

 int temp = array[i];
 array[i] = array[j];
 array[j] = temp;

share|improve this answer

answered Mar 28 at 10:00

Nitesh AgarwalNitesh Agarwal

344 bronze badges

int i = 0, j = n - 1;
for (i = 0; i < n/ 2; i++, j--)

 int temp = array[i];
 array[i] = array[j];
 array[j] = temp;

share|improve this answer

answered Mar 28 at 10:00

Nitesh AgarwalNitesh Agarwal

344 bronze badges

answered Mar 28 at 10:00

Nitesh AgarwalNitesh Agarwal

344 bronze badges

answered Mar 28 at 10:00

Nitesh AgarwalNitesh Agarwal

344 bronze badges