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#include<stdio.h> #include<conio.h> #include<math.h> void main(){ clrscr(); char choice='y'; int n,i,j,k; float h[10],a,b,c,d,sum,s[10]={0},x[10],F[10],f[10],p,m[10][10]={0},temp; printf("No of samples? "); scanf("%d",&n); printf("\nEnter all sample points: "); for(i=0;i<n;i++) scanf("%f%f",&x[i],&f[i]); for(i=n-1;i>0;i--){ F[i]=(f[i]-f[i-1])/(x[i]-x[i-1]); h[i-1]=x[i]-x[i-1]; } //*********** formation of h, s , f matrix **************// for(i=1;i<n-1;i++){ m[i][i]=2*(h[i-1]+h[i]); if(i!=1){ m[i][i-1]=h[i-1]; m[i-1][i]=h[i-1]; } m[i][n-1]=6*(F[i+1]-F[i]); } //*********** forward elimination **************// for(i=1;i<n-2;i++){ temp=(m[i+1][i]/m[i][i]); for(j=1;j<=n-1;j++) m[i+1][j]-=temp*m[i][j]; } //*********** backward substitution *********// for(i=n-2;i>0;i--){ sum=0; for(j=i;j<=n-2;j++) sum+=m[i][j]*s[j]; s[i]=(m[i][n-1]-sum)/m[i][i]; } while(choice=='y'){ printf("\nEnte