C "Do points make a rectangle"

[burningbannas]

Hi, I'm trying to make a program that you enter 4 x and y coordinates into that will then verify whether the 4 coordinates make up a rectangle. Also it needs to verify whether the inputs are valid (entering some letters or leaving the space blank should result in an error message). The output should just be one line saying either, "Is a rectangle" or "Isn't a rectangle". Ive already finished the verification part and made a function for verifying the rectangle but I'm unsure as to how to put it all together. Thanks

#include <stdio.h>
#include <stdbool.h>
//verifying point validity
int main(void)
{
    int x1, y1, x2, y2, x3, y3, x4, y4;

    printf("Enter point #1:\n");
    if (scanf("%d%d", &x1,&y1)==2)
    {
        goto two;
    }
    else
    {
        printf("Invalid Entry\n");
    }
two:
    printf("Enter point #2:\n");
    if (scanf("%d%d", &x2,&y2)==2)
    {
        goto three;
    }
    else
    {
        printf("Invalid Entry\n");  
    }
three:
    printf("Enter point #3:\n");
    if (scanf("%d%d", &x3,&y3)==2)
    {
        goto four;
    }
    else
    {
        printf("Invalid Entry\n");
    }
four:
    printf("Enter point #4:\n");
    if (scanf("%d%d", &x4,&y4)==2)
    {
        goto next;
    }
    else
    {
    printf("Invalid Entry\n");
    }
next:

    

}

//function for verifying rectangle

static bool IsRectangle(int x1, int y1, int x2, int y2,
                        int x3, int y3, int x4, int y4)
{
    x2 -= x1; x3 -= x1; x4 -= x1; y2 -= y1; y3 -= y1; y4 -= y1;
    return
    (x2 + x3 == x4 && y2 + y3 == y4 && x2 * x3 == -y2 * y3) ||
    (x2 + x4 == x3 && y2 + y4 == y3 && x2 * x4 == -y2 * y4) ||
    (x3 + x4 == x2 && y3 + y4 == y2 && x3 * x4 == -y3 * y4);
}