Why there is error here:

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program is about implementation on circular queue:

main.c:58:34: error: expected ‘)’ before ‘cqueue’
         printf("%d was deleted\n"cqueue[front]);
                                  ^~~~~~
main.c:58:18: warning: format ‘%d’ expects a matching ‘int’ argument [-Wformat=]
         printf("%d was deleted\n"cqueue[front]);
                  ^
main.c: In function ‘display’:
main.c:85:26: error: expected ‘)’ before ‘cqueue’
             printf("%d\n"cqueue[CAPACITY]);
                          ^~~~~~
main.c:85:22: warning: format ‘%d’ expects a matching ‘int’ argument [-Wformat=]
             printf("%d\n"cqueue[CAPACITY]);
                      ^

What I have tried:

C++

#include<stdio.h>
#define CAPACITY 5
int cqueue[CAPACITY];
int front=-1,rear=-1;
void enQueue(int x);
void deQueue();
void display();
int main()
{
    enQueue(5);
    enQueue(4);
    enQueue(3);
    enQueue(2);
    enQueue(1);
    deQueue();
    deQueue();
    deQueue();
    enQueue(6);
    enQueue(7);
    enQueue(8);
    display();
    
}
void enQueue(int x)
{
    if(((rear==(CAPACITY-1))&&(front==0))||(front==(rear+1)))
    {
        printf("cqueue is full\n");
    }
    else
    if((front==-1)&&(rear==-1))
    {
        front,rear=0;
        cqueue[rear]=x;
    }
        else
        if(rear==(CAPACITY-1))
        {
            rear=0;
            cqueue[rear]=x;
        }
        else
        {
            rear++;
            cqueue[rear]=x;
            printf("%d element was inserted\n",cqueue[rear]);
        }
}
void deQueue()
{
    if(front==-1)
    {
        printf("cqueue is empty\n");
    }
    else
    if(front==(CAPACITY-1))
    {
        printf("%d was deleted\n"cqueue[front]);  // error here  
        front=0;
        
    }
    else
    if(front==rear)
    {
        front=-1;
        rear=-1;
    }
    else
    {
        printf("%d was deleted\n",cqueue[front++]);
    }
}

void display()
{
    int i,j;
    if(front<=rear)
        for(i=front;i<=rear;i++)
        {
            printf("%d\n",cqueue[i]);
        }
        else
        {for(i=front;i<=(CAPACITY-1);i++)
        {
            printf("%d\n"cqueue[CAPACITY]);   //error here
        }
        for(j=0;j<=rear;j++)
        {
            printf("%d\n",cqueue[CAPACITY]);
        }
    }
}

Posted 7-May-21 19:47pm

_-_-_-me

Updated 7-May-21 20:49pm

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2 solutions

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2021-05-07T20:02:00

Look at the error message, and at the code it describes - you have a lot of information there:

main.c:58:34: error: expected ‘)’ before ‘cqueue’
         printf("%d was deleted\n"cqueue[front]);
                                  ^~~~~~

Let's break it down:

main.c:58:34: error: expected ‘)’ before ‘cqueue’
^       ^  ^         ^
|       |  |         Error message
|       |  --------- Column number
|       ------------ Line number
---------------------File name

So, the error is in "main.c", on line 58, column 34, and it's complaining that it "expected ‘)’ before ‘cqueue’"
It then shows you line 58 and points at where it found the problem, just to be helpful:

C

printf("%d was deleted\n"cqueue[front]);
                         ^~~~~~

So look at the code: it's saying it expected the printf function call to end after the format string, but it found something it didn't understand.
Hmmm ... shouldn't there be a comma between the format string and the parameters?

C

printf("%d was deleted\n", cqueue[front]);

Try that, and some of your other errors will go away at the same time!

_-_-_-me · Accepted Answer · 2021-05-07T20:49:00

Programme :

C++

#include<stdio.h>
#define CAPACITY 5
int cqueue[CAPACITY];
int front=-1,rear=-1;
void enQueue(int x);
void deQueue();
void display();
int main()
{
    enQueue(5);
    enQueue(4);
    enQueue(3);
    enQueue(2);
    enQueue(1);
    enQueue(0);
    deQueue();
    deQueue();
    deQueue();
    enQueue(6);
    enQueue(7);
    enQueue(8);
    printf("%d    %d\n",front,rear);
    display();
    
}
void enQueue(int x)
{
    if(((rear==(CAPACITY-1))&&(front==0))||(front==(rear+1)))
    {
        printf("cqueue is full\n");
    }
    else
  {  if((front==-1)&&(rear==-1))
    {
        front=0;
        rear=0;          
        cqueue[rear]=x;
        printf("%d element was added\n",cqueue[rear]);
    }
        else
       { if(rear==(CAPACITY-1))
        {
            rear=0;
            cqueue[rear]=x;
            printf("%d was added\n",cqueue[rear]);
        }
        else
        {
            rear++;
            cqueue[rear]=x;
            printf("%d element was inserted\n",cqueue[rear]);
        }}}
}
void deQueue()
{
    if(front==-1)
    {
        printf("cqueue is empty\n");
    }
    else
    if(front==(CAPACITY-1))
    {
        printf("%d was deleted\n",cqueue[front]);  
        front=0;
        
    }
    else
    if(front==rear)
    {
        front=-1;
        rear=-1;
    }
    else
    {
        printf("%d was deleted\n",cqueue[front++]);
    }
}

void display()
{
    int i,j;
    if(front<=rear)
        for(i=front;i<=rear;i++)
            printf("%d\n",cqueue[i]);
        else
        {
            for(i=front;i<=(CAPACITY-1);i++)
            printf("%d\n",cqueue[i]);   
            for(j=0;j<=rear;j++)
            printf("%d\n",cqueue[j]);
    }
}

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