Homework Answers
You are not seeing the reverse of the array because when you are calling interchange function, the swapping of digits only occur in formal parameters not in actual parameters.
for change to be occured in actual parameter, we have to pass address of the parameter in interchange function rather than the value.
I have made the changes in the program, which is given below, which will print reverse of array as output.
#include <iostream>
using namespace std;
void interchange(int *x, int *y)
{
int temp;
temp = *x;
*x = *y;
*y = temp;
}
void reverse(int *ptr, int first, int last)
{
int *endptr;
endptr = ptr+last;
for (ptr += first; ptr<= endptr; ptr++, endptr--)
{
interchange(ptr, endptr);
}
}
int main()
{
int a[3]={1,2,3};
reverse(a,0,2);
for(int i =0; i<3; i++)
{
cout<<a[i]<<",";
}
}
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