do while problem

Hi, I am very new to C and creating a program converting Celsius to Fahrenheit. I have a "do while" command so the user can loop the program if he/she choose to. The problem is that instead of looping the program it ignores the user input and continue the program.
I hope someone can help me with this problem.
Thanks in advance

Code:

#include <stdio.h>
#include <stdlib.h>
int main ()


{
    char temp ;
    int tempdegree ;
    float tempequals ;
    char restart;
    
    do
    {
        printf("Welcome to fahrenheit to celsius (vice versa) converter!\n\nPress F to convert fahrenheit to celsius or press C to convert celsius to fahrenheight: ") ;
        scanf ("%c", &temp);
        if (temp=='f' || temp=='F')
        {    
            system("cls");
            printf ("Please pick the temperature you want to convert:");
            scanf ("%d", &tempdegree);
            tempequals=0.555555556*(tempdegree-32);
            printf ("%d fahrenheit equals %f celsius.\n\n\nPress r to restart program", tempdegree, tempequals);
            scanf ("%c", &restart);
        }    
        else if (temp=='c' || temp=='C')
            {    
                system("cls");
                printf ("Please pick the temperature you want to convert:");
                scanf ("%d", &tempdegree);
                tempequals=(1.8*tempdegree)+32;
                printf ("%d celsius equals %f Fahrenheit.\n\n\nPress r to restart program.", tempdegree, tempequals);
                scanf ("%c", &restart);
            } 
    
    } while (restart=='r' || restart=='R');        //instead of looping when inserted "R" the program continues. 
    
    getchar ();
    
    return 0;
}

scanf is tricky with whitespace. scanf %c will give you the linefeed from the previous scanf which is not an 'r' or 'R'. change scanf("%c"... to scanf(" %c"... (add a space before %c)

edit : do that for all the scanf("%c's including the top one

Thank you so much for your help dmh2000, it worked perfectly.