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Function to reverse an integer array

Reverses and array of integer.

Submitted By: cipherence

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Views: 28,631

Language: C++

Last Modified: August 28, 2006

Instructions: This function(ReverseArray is used to reverse an integer array. For example, if the
array is {1,2,3,4,5}, these functions will return an array like {5,4,3,2,1}.
The user needs to pass in a pointer to the array and the size of the array,
and the function will return a pointer to an array in the reverse order.

Snippet

// this code was copied from cprogramming.com
// my respects for posting this code with
// no official whereabouts as to where it was from
int*ReverseArray(int*orig,unsigned short int b)
{
unsigned short int a=0;
int swap;
for(a;a<--b;a++) //increment a and decrement b until they meet eachother
{
swap=orig[a]; //put what's in a into swap space
orig[a]=orig[b]; //put what's in b into a
orig[b]=swap; //put what's in the swap (a) into b
}
return orig; //return the new (reversed) string (a pointer to it)
}
// the following is a test program
#include<iostream>
int main()
{
const unsigned short int SIZE=10;
int ARRAY[SIZE]={1,2,3,4,5,6,7,8,9,10};
int*arr=ARRAY;
for(int i=0;i<SIZE;i++)
{
std::cout<<arr[i]<<' ';
}
std::cout<<std::endl;
arr=ReverseArray(arr,SIZE);
for(int i=0;i<SIZE;i++)
{
std::cout<<arr[i]<<' ';
}
std::cout<<std::endl;
std::cin.get();
return 0;
}

Copy & Paste

// this code was copied from cprogramming.com
// my respects for posting this code with 
// no official whereabouts as to where it was from

int*ReverseArray(int*orig,unsigned short int b)
{
    unsigned short int a=0;
    int swap;
    
    for(a;a<--b;a++) //increment a and decrement b until they meet eachother
    {
        swap=orig[a];       //put what's in a into swap space
        orig[a]=orig[b];    //put what's in b into a
        orig[b]=swap;       //put what's in the swap (a) into b
    }
    
    return orig;    //return the new (reversed) string (a pointer to it)
}
// the following is a test program
#include<iostream>

int main()
{
    const unsigned short int SIZE=10;
    int ARRAY[SIZE]={1,2,3,4,5,6,7,8,9,10};
    int*arr=ARRAY;
    
    for(int i=0;i<SIZE;i++)
    {
        std::cout<<arr[i]<<' ';
    }
    std::cout<<std::endl;
    arr=ReverseArray(arr,SIZE);
    for(int i=0;i<SIZE;i++)
    {
        std::cout<<arr[i]<<' ';
    }
    std::cout<<std::endl;
    std::cin.get();
    return 0;
}

Comments
David W 2008-10-07 01:48:54
/* A simplified demo of reversing an array of integers / #include / Recall that in C (or C++) arrays are always passed by ref / myReverseArray( int ary[], int b ) { int a; for( a=0; a < --b; a++ ) / increment a and decrement b until they meet / { int temp = ary[a]; / get temp copy of ary[a] / ary[a] = ary; / ary
David W 2008-10-07 01:54:12
CODE /* Recall that in C (or C++) arrays are always passed by ref / myReverseArray( int ary[], int b ) { int a; for( a=0; a < --b; a++ ) / increment a and decrement b until they meet / { int temp = ary[a]; / get temp copy of ary[a] / ary[a] = ary<b>; / ary<b> <-- ary[a] / ary<b> = temp; / ary<b> <-- temp */ } }
sithujabi 2008-12-02 08:03:51
hey tanks alot........it was very much helpful for me.........tank u once again....