solution of balagurusamy of chapter 7.1

#include<stdio.h>
void main(void)
{
int n,i;
float m,c,x[100],y[100],a=0,b=0,d=0,e=0,f;
printf("Enter the number of co-ordinates: ");
scanf("%d",&n);
for(i=1;i<=n;++i)
{
printf("x (%d)= ",i);
scanf("%f",&x[i]);
printf("y (%d)= ",i);
scanf("%f",&y[i]);
}
for(i=1;i<=n;++i)
{
a+=x[i]*y[i];
b+=x[i];
d+=y[i];
e+=x[i]*x[i];
}
f=b*b;
m=(n*a-b*d)/(float)(n*e-f);
c=(1/(float)n)*(d-m*b);
printf("\n");
printf("\nEquation of the straight line:-\n\n");
printf("y=%.1fx + %.1f",m,c);
}