Answer 1

your code has many errors.
I checked your code on my laptop so the line numbers may be different just check where what I wrote appears, if the line are not the same .

if ((front = 0 && rear = size - 1) || rear = size + 1) should be
if ((front == 0 && rear == size - 1) || rear == size + 1)

+ there is a typo in line 55 if((front=0&&rear=size-1)||raer=size+1)
rear is spelled raer .
+ line 74 you should ad a { like this :
if (rear >= front){ and close it before else{
+ in function del_in_CQ(int CQueue[])
the first return has no value . should be return ret;

in general it is a good idea to enclose your IF statement and for loops inside {} .
example :
int i=0;
if(rear>=front)
for(i=0;i<front;i++)
cout<<"-";
cout<<"<<<";
for(i=front;i<rear;i++)
cout<<CQueue[i]<<"<-";
cout<<CQueue[rear]<<">>>"<<endl;
else
{

should be

int i=0;
if(rear>=front){
for(i=0;i<front;i++){
cout<<"-";
cout<<"<<<";
for(i=front;i<rear;i++)
cout<<CQueue[i]<<"<-";
cout<<CQueue[rear]<<">>>"<<endl;
}
else
{

after fixing everything if it does not compile remove
#include <process.h>
and see if it compiles.