CareerCup

Reversing an integer array:

void reverse(int a[],int len){
int i,temp;
for(i=0;i<len/2/;i++){
temp = a[i];
a[i] = a[len-i];
a[len-1] = temp;
}
}

is it true

Yeah I'll give it a shot. For Java int array:

public class Reverse
{
	public static void reverse(int[] data)
	{
		int length = data.length;
		for(int i = 0; i < data.length/2; i++)
		{
			int temp = data[i];
			data[i] = data[data.length-1-i];
			data[data.length-1-i] = temp;
		}
	}
}

hey put it in a stack and retrieve it..i think that would do the job.

@rkt -- here your code is wrong for some i/p ex-{1,2,3,4} when u iterate this i/p u find an error.....
correct code is.....
// here len of the array means no of element in that array.....

void reverse(int a[],int len){
int i,temp;
if(len%2==0)
{
len =len-1;
for(i=0;i<(len/2)+1;i++){
temp = a[i];
a[i] = a[len-i];
a[len-i] = temp;
}
}
else
{

for(i=0;i<len/2;i++){
temp = a[i];
a[i] = a[len-1-i];
a[len-1-i] = temp;
}
}


}

#include<stdio.h>
#include<stdlib.h>

void print(int *arr, int len) {
	int i;
	for (i=0;i<len;i++)
		printf("%d, ", arr[i]);
	printf("\n");
}

void swap(int *a, int *b) {
	int tmp=*a;
	*a=*b;
	*b=tmp;
}

void reverse(int *arr, int len) {
	int i=0;
	while (i < len--)
		swap(&arr[i++], &arr[len]);
}

int main(void) {
	int *arr=NULL;
	int size, i;
	printf("Enter array size : ");
	scanf("%d",&size);
	arr=(int *)calloc(size,sizeof(int));
	for(i=0;i<size;i++)
		scanf("%d",&arr[i]);
	print(arr,size);
	reverse(arr,size);
	print(arr,size);
	free(arr);
	return 0;
}