BASIC-50/half reverse at main · mithunbarath/BASIC-50 · GitHub

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#include<stdio.h>
int main() {
    int n=12345,ans=0,r=0;
    int c=floor(log10(n))+1;
    int half=(c/2)+1;
    int t_half=half;
    while(half)
    {
        r=n%10;
        ans=ans*10+r;
        half--;
        n=n/10;
    }
    int fans=n*pow(10,t_half)+ans;
    printf("%d",fans);
}
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Need to write a program left and right half separately

Input Format

7
1 2 3 4 5 6 7

Constraints

1<=n<=20

Output Format

3 2 1 4 7 6 5

Sample Input 0

6
1 2 3 4 5 6
Sample Output 0

3 2 1 6 5 4
front and back
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() {

    int n,i;
    scanf("%d",&n);
    int a[n];
    for(i=0;i<n;i++)
        scanf("%d",&a[i]);
    int half=n/2;
    int l=0;
    int r=half-1;
    while(l<r)
    {
        int temp=a[l];
        a[l]=a[r];
        a[r]=temp;
        l++;
        r--;
    }
    half=ceil(n/2.0);
    l=half;
    r=n-1;
     while(l<r)
    {
        int temp=a[l];
        a[l]=a[r];
        a[r]=temp;
        l++;
        r--;
    }
    for(i=0;i<n;i++)
        printf("%d ",a[i]);

    return 0;
}


------------------------------------------------------------------------------------------------------------------
Array
#include<stdio.h>
int main() {
    int n,L,r,temp;
    scanf("%d",&n);
    int a[n];
    for(int i=0;i<n;i++)
        scanf("%d",&a[i]);
    int half=n/2;
    L=half;
    r=n-1;
    while(L<r)
    {
        temp=a[L];
        a[L]=a[r];
        a[r]=temp;
        L++;
        r--;
    }
    for(int i=0;i<n;i++)
        printf("%d",a[i]);
}
------------------------------------------------------------------------------------------------------------------
front and back
#include<stdio.h>
int main(){
 int n,i,l,r;
 scanf("%d",&n);
 int a[n];
 for(i=0;i<n;i++)
   scanf("%d",&a[i]);
 int half=n/2;
    l=half;
    r=n-1;
    while(l<r)
    {
        int temp=a[l];
        a[l]=a[r];
        a[r]=temp;
        l++;
        r--;
    }
    l=0,r=half-1;
    while(l<r)
    {
        int temp=a[l];
        a[l]=a[r];
        a[r]=temp;
        l++;
        r--;
    }
    for(i=0;i<n;i++)
        printf("%d ",a[i]);
}