#include<iostream.h>
#include<iomanip.h>
#include<conio.h>

function1(float x1, float x2, float x3, float x4) {
float s;
s = 0.1*x1-0.001*x1*x2-x1*x1*(1-x3)*0.4;
return(s);}

main(){
float k=1;
float c=3;

k=function1(2,0,1,0);
cout <<"\n Peremennaya k =" << k;
Sleep(5000);
return 0; } 

 
#include<iostream.h>
#include<iomanip.h>
#include<conio.h>

main(){
float mas[3][4];
float k,c;

for (int i = 0; i < 3; i++){
  for (int j = 0; i < 4; j++){
 mas [j]= i;
cout <<"\n Element massiva s nomerom["<<i<<"]["<<j<<"] = " << mas[j];
}}
Sleep(5000);}

#include<iostream.h> #include<iomanip.h> #include<conio.h>
float f1(float x1, float x2, float x3, float x4){
return  0 . 1 *x1- 0 . 001 *x1*x2-x1*x1*( 1 -x3)* 0 . 4 ;}
float f2(float x1, float x2, float x3, float x4){
return  0 . 01 *x1*x2- 0 . 1 *x2*x2-x2*x2*( 2 -x4)* 1 . 25 ;}
float f3(float x1, float x2, float x3, float x4){
return x3*( 0 . 1 - 0 . 01 *x2+ 2 . 5 *x1*(x3- 1 ))+x4* 0 . 01 *x2+ 2 . 5 *x1*( 1 -x3);}
float f4(float x1, float x2, float x3, float x4){
return -x3*x1* 0 . 01 +x4*( 0 . 01 *x1- 0 . 2 *x2- 1 . 25 *x2*( 2 -x4))+ 2 . 5 *x2*( 2 -x4);}

main(){
float mas[ 4 ][ 2 ];
float p1,p2,p3,p4;

mas[ 1 ][ 0 ]= 10 ;
mas[ 2 ][ 0 ]= 2 ;
mas[ 3 ][ 0 ]= 1 ;
mas[ 4 ][ 0 ]= 2 ;
p1=f1(mas[ 1 ][ 0 ],mas[ 2 ][ 0 ],mas[ 3 ][ 0 ],mas[ 4 ][ 0 ]);
p2=f1(mas[ 1 ][ 0 ]+ 0 . 5 *p1,mas[ 2 ][ 0 ]+ 0 . 5 *p1,mas[ 3 ][ 0 ]+ 0 . 5 *p1,mas[ 4 ][ 0 ]+ 0 . 5 *p1);
p3=f1(mas[ 1 ][ 0 ]+ 0 . 5 *p2,mas[ 2 ][ 0 ]+ 0 . 5 *p2,mas[ 3 ][ 0 ]+ 0 . 5 *p2,mas[ 4 ][ 0 ]+ 0 . 5 *);
p4=f1(mas[ 1 ][ 0 ]+p3,mas[ 2 ][ 0 ]+p3,mas[ 3 ][ 0 ]+p3,mas[ 4 ][ 0 ]+p3);
mas[ 1 ][ 1 ]=mas[ 1 ][ 0 ]+( 1 / 6 )*(p1+ 2 *p2+ 2 *p3+p4);

cout <<"\n Peremennaya x1(1) =" <<mas[ 1 ][ 1 ];
Sleep( 5000 ); }

#include<iostream.h> #include<iomanip.h> #include<conio.h>
float f1(float x1, float x2, float x3, float x4){ return  0 . 1 *x1- 0 . 001 *x1*x2-x1*x1*( 1 -x3)* 0 . 4 ;}
float f2(float x1, float x2, float x3, float x4){ return  0 . 01 *x1*x2- 0 . 1 *x2*x2-x2*x2*( 2 -x4)* 1 . 25 ;}
float f3(float x1, float x2, float x3, float x4){ return x3*( 0 . 1 - 0 . 01 *x2+ 2 . 5 *x1*(x3- 1 ))+x4* 0 . 01 *x2+ 2 . 5 *x1*( 1 -x3);}
float f4(float x1, float x2, float x3, float x4){ return -x3*x1* 0 . 01 +x4*( 0 . 01 *x1- 0 . 2 *x2- 1 . 25 *x2*( 2 -x4))+ 2 . 5 *x2*( 2 -x4);}

main(){
  float mas[ 2 ][ 4 ];
  float p1,p2,p3,p4;
 
 mas[ 0 ][ 0 ]= 10 ;  mas[ 0 ][ 1 ]= 2 ;  mas[ 0 ][ 2 ]= 1 ;  mas[ 0 ][ 3 ]= 2 ;
  p1=f1(mas[ 0 ][ 0 ],mas[ 0 ][ 1 ],mas[ 0 ][ 2 ],mas[ 0 ][ 3 ]);
  p2=f1(mas[ 0 ][ 0 ]+ 0 . 5 *p1,mas[ 0 ][ 1 ]+ 0 . 5 *p1,mas[ 0 ][ 2 ]+ 0 . 5 *p1,mas[ 0 ][ 3 ]+ 0 . 5 *p1);
  p3=f1(mas[ 0 ][ 0 ]+ 0 . 5 *p2,mas[ 0 ][ 1 ]+ 0 . 5 *p2,mas[ 0 ][ 2 ]+ 0 . 5 *p2,mas[ 0 ][ 3 ]+ 0 . 5 *);
  p4=f1(mas[ 0 ][ 0 ]+p3,mas[ 0 ][ 2 ]+p3,mas[ 0 ][ 3 ]+p3,mas[ 0 ][ 4 ]+p3);
  mas[ 1 ][ 0 ]=mas[ 0 ][ 0 ]+( 1 / 6 )*(p1+ 2 *p2+ 2 *p3+p4);
  mas[ 1 ][ 1 ]= 1 ;
  mas[ 1 ][ 2 ]= 2 ;
  mas[ 1 ][ 3 ]= 3 ;
  cout <<"\n Peremennaya x1(1) =" <<p4;
  Sleep( 5000 ); }