swapHalves.c

#include<stdio.h>
int length;
int list[1000];

void swapHalves(){
    int tempList[length];
    int mid = length/2;


    for(int i = 0; i < length; i++)
        tempList[i] = list[i];

    if(length%2 == 1){ //If ODD
        //Swap first half to last half
        for(int i = 0; i < mid; i++)
            list[mid+i+1] = tempList[i];
        list[mid] = tempList[mid];
        //Swap last half to first half
        for(int i = 0; i < mid; i++)
            list[i] = tempList[mid+i+1];
    }
    else{ // If Even
        //Swap first half to last half
       for(int i = 0; i < mid; i++)
            list[mid+i] = tempList[i];
        //Swap last half to first half
        for(int i = 0; i < mid; i++)
            list[i] = tempList[mid+i];
    }



}

void swap(){

    int tempList[length];
    for(int i = 0; i < length; i++)
        tempList[i] = list[i];

    if(length%2 == 0)
        for(int i = 0; i < length/2; i++)
            list[i+length/2] = tempList[i];
    else
        for(int i = 0; i < length/2; i++)
            list[i+(length/2)+1] = tempList[i];


    for(int i = length/2; i < length; i++)
        list[i-length/2] =  tempList[i];


}

void prrintList(){
    for(int i = 0; i<length; i++){
        printf("%d ",list[i]);

    }
}

int main(){
    int c = 1;
    length = 0;

    for (int i = 0; i < 5; i++)
    {
        list[i] = c++;
        length++;
    }

    prrintList();
    printf("\n\n");

    swap();//Apu's Try
    prrintList();
    printf("\n\n");

//Reseting Data Again
    c = 1;
    length = 0;
    for (int i = 0; i < 5; i++)
    {
        list[i] = c++;
        length++;
    }

    swapHalves();
    prrintList();

    return 0;
}