bai TH phuong phap tinh

#include <conio.h>
#include <stdio.h>
#include <math.h>

//ct tinh gia tri da thuc bac n tong quat theo so do Hoocner
main(){
       int n, i;
       float  a[50], c, p;
       printf("Nhap bac cua da thuc: ");
       scanf("%d", &n);
       printf("Cac he so: \n");
       for(i = 0; i <= n; i++){
             printf("a[%d] = ",i );
             scanf("%f", &a[i]);
       };
       printf("\nNhap gia tri can tinh c: ");
       scanf("%f", &c);
       p = a[0];
       for(i = 1; i <= n; i++){
             p = p * c + a[i];
       };
       printf("\n---------------------------------------------");
        printf("\nBac cua thuc da nhap la : ");
       for (i=n;i>=0;i--) printf("%1.2f ",a[i]);
       printf("\n");
       printf("\nKet qua p(%0.3f)=  %0.3f", c, p);
       getch();
};

********************************************************************************

#include<stdio.h>
#include<conio.h>

//cho da thuc p(x) bac n, ct xac dinh cac he so cua da thuc p(y+c)
//theo so do Hoocner tong quat
main(){
       int n, i, k;
       float c, a[50];
       printf("Nhap bac da thuc: ");
       scanf("%d", &n);
       printf("Cac he so: \n");
       for(i = 0; i <= n; i++){
             printf("\n a[%d] = ", i);
             scanf("%f", &a[i]);
       };
       printf("Nhap gia tri can tinh = ");
       scanf("%f", &c);
       for(k = n; k>= 1; k--){
             for(i = 1; i <= k; i++){
                   a[i] = a[i - 1]*c + a[i];
             }
       };
        printf("\n---------------------------------------------");
        printf("\nCac he so cua da thuc da nhap la : ");
       for (i=n;i>=0;i--) printf("%1.2f ",a[i]);
       printf("\n");
       printf("Cac he so cua da thuc p(y + %0.3f) :\n", c);
       for(i = 0; i <= n; i++){
             printf("\ta[%d] = %0.3f\n", i, a[i]);
       };
       getch();
};

***************************************************************************************

#include<stdio.h>
#include<conio.h>

float _Hoocner(int n, float c, float *a){
      float p = a[0];
      for (int i = 1; i <= n; i++)
          p = p * c + a[i];
      return p;
};
void _Nhap(float *a, int &n){
     int i;
     printf("Nhap bac cua da thuc: ");
     scanf("%d", &n);
     printf("Cac he so: \n");
     for(i = 0; i <= n; i++){
           printf("a[%d] = ",i );
           scanf("%f", &a[i]);
     };
};
main(){
       int n, i, m;
       float a[50], b[50];
       float y, z, t, v, c;
       printf("\t--- 1.2a ---\n");
       _Nhap(a, n);
       printf("\n\nNhap 2 gia tri y va z: \n");
       printf("y = "); scanf("%f", &y);
       printf("z = "); scanf("%f", &z);
       t = _Hoocner(n, y, a) + _Hoocner(n, z, a);
       printf("\nS1 = p(%0.f) + p(%0.f) = %0.3f", y, z, t);
       //-----------------------------
       printf("\n\n\t--- 1.2b ---\n");
       printf("__Da thuc pn(x)__ \n");
       _Nhap(a, n);
       printf("__Da thuc pm(y)__ \n");
       _Nhap(b, m);
       printf("\nNhap gia tri can tinh: ");
       scanf("%f", &c);
       v = _Hoocner(n, c, a) + _Hoocner(m, c, b);
       printf("\npn(%.f) + pm(%.f) = %0.3f", c, c, v);
       getch();
};


********************************************************************************

#include<stdio.h>
#include<conio.h>
#include<math.h>

//phuong phap chia doi

float Hoocner(int n, float c, float *a){
      float p = a[0];
      for (int i = 1; i <= n; i++)
          p = p * c + a[i];
      return p;
};

main(){
       int i, n;
       float a[50], x1, x2, x3;
       printf("Nhap bac cua da thuc: ");
       scanf("%d", &n);
       for(i = 0; i <= n; i++){
             printf("a[%d] = ", i);
             scanf("%f", &a[i]);
       };
       nhaplai:
       printf("Nhap khoang nghiem (a, b): \n");
       printf("a = "); scanf("%f", &x1);
       printf("b = "); scanf("%f", &x2);
       printf("Khoang nghiem la (%0.3f, %0.3f)", x1, x2);
       if((Hoocner(n, x1, a) < 0) && (Hoocner(n, x2, a) > 0)){
                       do{
                          x3 = (x1 + x2) / 2;
                          if (Hoocner(n, x3, a) > 0) x2 = x3;
                          else x1 = x3;
                       } while((Hoocner(n, x3, a) != 0) && (fabs(x1 - x2) >= 1e-3));
       printf("\n\n\t ==>>Nghiem cua phuong trinh (PP chia doi) = %.3f", x3);
       goto exit;
       }
       else
           printf("\n\n\t ==>>(%.3f,%.3f) khong phai khoang nghiem...hay nhap lai\n\n",x1, x2);
           goto nhaplai;
       exit:
       getch();
};


****************************************************************************

#include<stdio.h>
#include<conio.h>
#include<math.h>


float _f(int n, float c, float *z){
      float p = z[0];
      for (int i = 1; i <= n; i++)
          p = p * c + z[i];
      return p;
};

main(){
       int i, n;
       float z[50], a, b, x;
       printf("Nhap bac cua da thuc: ");
       scanf("%d", &n);
       for(i = 0; i <= n; i++){
             printf("z[%d] = ", i);
             scanf("%f", &z[i]);
       };
       _nhaplai:
       printf("Nhap khoang nghiem (a, b): \n");
       printf("a = "); scanf("%f", &a);
       printf("b = "); scanf("%f", &b);
       printf("Khoang nghiem la (%0.3f, %0.3f)", a, b);

       if(_f(n, a, z)*_f(n, b, z) < 0){
                x = a - (b - a)*_f(n, a, z) / (_f(n, b, z) - _f(n, a, z));
                if (_f(n, x, z) * _f(n, a, z) < 0){
                   do{
                      b = x;
                      x = a - (b - a)*_f(n, a, z) / (_f(n, b, z) - _f(n, a, z));
                   }while (fabs(x - b) > 1e-3);
                }
                else{
                     do{
                        a = x;
                        x = a - (b - a)*_f(n, a, z) / (_f(n, b, z) - _f(n, a, z));
                     }while (fabs(x - a) > 1e-3);
                }
                printf("\n\n\t ==>>Nghiem cua phuong trinh (PP day cung) = %.3f", x);
                goto exit;
       }
       else
           printf("\n\n\t ==>>(%.3f, %.3f) khong phai khoang nghiem...hay nhap lai\n\n", a, b);
           goto _nhaplai;
       exit:
       getch();
};
------------------------------------------------------------
#include<stdio.h>
#include<conio.h>
#include<math.h>
#define eps 0.0001
float g(float x)
{
 return pow(x+1, 1.0/3);
}
main()
{
 float y, x;
 printf("nhap xap xi nghiem ban dau: ");
 scanf("%f", &x);
 while (fabs(y-x)>eps)
 {
  y=x;
  x=g(y);
 }
 printf("pt co nghiem x= %.3f", x);
 getch();

}
---------------------------------------------------------------
#include<stdio.h>
#include<conio.h>
#include<math.h>
#define eps 0.0001
float heso[50], a, b, c;
int n;
double p(float x)
{
 double k=heso[0];
 int i;
 for (i=1;i<=n;i++) k=k*x+heso[i];
 return k;
}
void nhap()
{
 printf("nhap bac cua phuong trinh "); scanf("%d", &n);
 printf("nhap cac he so: ");
 for (int i=0;i<=n;i++) scanf("%f", heso+i);
 do
 { printf("nhap khoang nghiem: ");
   scanf("%f%f", &a, &b);
   printf("%f, %f", p(a), p(b));
 }
 while(p(a)*p(b)>0);
}
main()
{
 nhap();
 if(p(a)>0)
 for(int i=0;i<=1;i++) heso[i]*=-1;
 while(p(c)>eps)
 {
  c=(a+b)/2;
  if (p(c)<0) a=c;
   else b=c;
 }
 printf("pt co nghiem x = %f ", c);
 getch();
}