っｇ

#include <stdio.h>

#include <math.h>

int main(void){

int i,j,N;

double x[10],y[10],Sx,Sy,Sxy,Sxx,a,b,D;

FILE *fp;

fp=fopen("ff.txt","r");

for(j=0;j<10;j++){

fscanf(fp,"%lf %lf",&x[i],&y[i]);

}

N=10;

Sx=0.0;

Sy=0.0;

Sxy=0.0;

Sxx=0.0;

for(i=0; i<10; i++){

Sx+=x[i];

Sy+=y[i];

Sxy+=(x[i]*y[i]);

Sxx+=(x[i]*x[i]);

}

D=N*Sxx-Sx*Sx;

a=(N*Sxy-Sx*Sy)/D;

b=(Sxx*Sy-Sxy*Sx)/D;

printf("a=%f,b=%f",a,b);

fclose(fp);

return 0;

}