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Least Square Fitting of several data points as a straight line

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/* Least Square Fit */
#include<stdio.h>
#include<math.h>
int main()
{
    int i, n;
    float m, c, X[50], Y[50], Sx=0, Sy=0, Sxy=0, Sx2=0;
    printf("Enter the no. of input data=");
    scanf("%d", &n);
    printf("\n Enter the values of x:\n");
    for (i=0;i<n;i++)
    {
        scanf("%f", &X[i]);
    }
    printf("\n Enter the values of y:\n");
    for (i=0;i<n;i++)
    {
    scanf("%f", &Y[i]);
    }
    for (i=0;i<n;i++)
    {
        Sx=Sx+X[i];
        Sy=Sy+Y[i];
        Sx2=X[i]*X[i];
        Sxy=Sxy+X[i]*Y[i];
   
    }
    m=(n*Sxy-Sx*Sy)/(n*Sx2-Sx*Sx);
    c=(Sx2*Sy-Sx*Sxy)/(n*Sx2-Sx*Sx);
    printf("\n The line of best fit is : y=%fx+%f\n", m,c);
    return(0);
}
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