Thread: Program returning negative numbers

Hey everyone! The results of printing 'circle', switch case #3, comes out as a long negative number, although I'm sure the result should be positive. Am I overflowing? I've tried typecasting as double, long, etc, I can't seem to figure it out. Thanks!

Code:

int main(void)
{
        int choice, x=0, square=0, cube=0, circle=0;
        printf("Welcome to the Area Calculation Program.\n");
        printf("(1)Square\n(2)Cubee\n(3)Circle\n");
        printf("Please make a selection.\n");
        scanf("%d", &choice);
        while(choice<1 || choice>3)
        {
                printf("Incorrect choice.  Please choose from the 3 options. \n");
                scanf("%d", &choice);
        }
        switch(choice)
        {
                case 1:
                        printf("Please enter a positive number. \n");
                        scanf("%d", &x);
                        while(x<=0)
                        {
                                printf("Please enter a positive number.\n");
                                scanf("%d", &x);
                        }
                        square=x*x;
                        printf("The side length of the square is %d.\n", x);
                        printf("The area of the square is %d.\n", square);
                        break;
                case 2:
                        printf("Please enter a positive number. \n");
                        scanf("%d", &x);
                        while(x<=0)
                        {
                                printf("Please enter a positive number.\n");
                                scanf("%d", &x);
                        }
                        cube=6*x*x;
                        printf("The side length of the cube is %d. \n", x);
                        printf("The area of the cube is %d. \n", cube);
                        break;
                case 3:
                        printf("Please enter a positive number. \n");
                        scanf("%d", &x);
                        while(x<=0)
                        {
                                printf("Please enter a positive number. \n");
                                scanf("%d", &x);
                        }
                        circle=3.14159*x*x;
                        printf("The radius is %d\n", x);
                        printf("The area of the circle is %lf\n", circle);
                        break;
                default:
                        printf("Please choose from the 3 options. \n");
                        scanf("%d", &choice);
                        break;
        }


}

Thanks! So simple.