Sign in to follow this  

help me newbie

This topic is 2850 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

#include <iostream>
using namespace std;

int main(){
    int x = 11;
	int y = 12;
	int a[5];
	int u = 31;
	int v = 32;
	
    //filling values
    for(int j= 0; j < 5 ; j++){
            for (int x = 21; x <= 25; x++)
                a[j] = x;
                }

    
	
	cout << "Printing changed value " << endl;
    for (int i = 0; i < 5 ; i++) 
        cout << "Value of " <<  i << " is " <<  a[i] << " ." << endl;
        
    system("pause");
    return 0;
}
I am trying to change arrays value to 21,22,23,24,25 But it is showing all value 25 What is wrong

Share this post


Link to post
Share on other sites
Taking thi snippet:
for (int j= 0; j < 5 ; j++) {
for (int x = 21; x <= 25; x++)
a[j] = x;
}

Consider what is happening if we unroll the inner loop:
for (int j= 0; j < 5 ; j++) {
a[j] = 21;
a[j] = 22;
a[j] = 23;
a[j] = 24;
a[j] = 25;
}
See what's going on? :)


To find an algorithm that works, let's take a look at the results we're ultimately looking for:
a[0] = 21;
a[1] = 22;
a[2] = 23;
a[3] = 24;
a[4] = 25;
Notice the pattern, the relationship between the index of the array element and its desired value: value = index + 21.
Using our new found insight:
for (int j= 0; j < 5 ; j++) {
a[j] = j + 21;
}

Share this post


Link to post
Share on other sites

This topic is 2850 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this