"Guess the Number" game in C

This is my first program in C. I'd rather not form any bad habits now. Is there anything that looks like bad practice, or something just looks wrong?

#include 
#include 
#include 

int main(void) {
    srand(time(NULL));
    int r = rand() % 10 + 1;
    int correct = 0; 
    int guess; 
    int counter = 0; 

    printf("Guess my number! "); 

    do {
        scanf("%d", &guess);
        if (guess == r) {
            counter++;
            printf("You guessed correctly in %d tries! Congratulations!\n", counter);
            correct = 1; 
        }

        if (guess  r) { 
            counter++; 
            printf("Your guess is too high. Guess again. ");
        }
    } while (correct == 0);

    return 0;
}

Here are some of the improvements i can suggest:

• move your counter variable , from the inside the if statements , as increasing the count is independent of the if condition.

-
Use srand(time(NULL)); , below the declarations , or else , your compiler may throw this warning , when compiled using C90 standard.

warning: ISO C90 forbids mixed declarations and code [-pedantic]

So to ensure portability , avoid statements between declarations.

-
In the long run , more meaningful and formal names , can be used instead of names like r and guess.

In my personal opinion , these two changes would be better:

-
Using a break; , when the correct number is guessed , can eliminate the need for using an extra variable correct.

-
I would prefer to use just a while() instead of do{}while();, if the program logic permits it.

Here is the program , modified with the changes , i listed above:

#include 
#include 
#include 

int main(void) 
{

int random_num = 0;
int guessed_num = 0;
int counter = 0; 

srand(time(NULL));
random_num = rand() % 10 + 1;

printf("Guess my number! "); 

    while(1)
    {
        counter++; 

        scanf("%d", &guessed_num);

        if (guessed_num == random_num) 
        {
            printf("You guessed correctly in %d tries! Congratulations!\n", counter); 
            break;
        }

        if (guessed_num  random_num) 
            printf("Your guess is too high. Guess again. ");

    } 

return 0;   
}

StackExchange Code Review Q#24366, answer score: 7