Numerical Mathematics : Curve Fitting (C Programming )

Numerical Mathematics: Curve Fitting

Sample input : 

T	700	720	740	760
V	0.0977	0.12184	0.1406	0.15509

 #include<stdio.h>  
 int main()  
 {  
   float y[50],x[50],sumx=0,X,xx,sumxx=0,sumy=0,sumxy=0,xsum,ysum,a1,a0;  
   int n;  
 printf("Enter the Range :");  
 scanf("%d",&n);  
 //....................................  
 printf("ENTER x =\n");  
 for(int i=0;i<n;i++)  
 {  
   scanf("%f",&x[i]);  
   sumx=sumx+x[i];  
   sumxx=sumxx+(x[i])*(x[i]);  
 }  
 xsum=(sumx/n);  
 //....................................  
 printf("ENTER y =\n");  
 for(int i=0;i<n;i++)  
 {  
   scanf("%f",&y[i]);  
   sumy=sumy+y[i];  
 }  
 ysum=(sumy/n);  
 //.....................................  
 for(int i=0;i<n;i++)  
 {  
   sumxy=sumxy+x[i]*y[i];  
 }  
 //.....................................  
 a1=((n*sumxy)-(sumx*sumy))/((n*sumxx)-((sumx)*(sumx)));  
 printf("a1=%f",a1);  
 a0=((ysum)-(a1*xsum));  
 printf("\n\na0=%f",a0);  
 printf("\n NOw ENTER the value of X :");  
 printf("\nY=a0+a1X=");  
 scanf("%f",&X);  
 xx=a0+a1*X;  
 printf("\nANS= %f",xx);  
 return 0;  
 }