#include <stdio.h>
#include <math.h>
void main()
{double a=2, S, f1, x=1;
while (x<=3)
{f1=0;
if (x>=a)
{for (int n=0;n<=10;++n)
f1+=pow(x-1,2*n-1)/(2*n+1)/pow(x+1,2*n+1);
f1=2*f1;
S=a*f1; printf("\nz=%f\t",a*log(x));}
else
{for(int n=0;n<=10;++n)
f1+=pow(a-1,2*n-1)/(2*n+1)/pow(a+1,2*n+1);
f1=2*f1;
S=x*f1; printf("\nz=%f\t",x*log(a));}
printf("\nS=%f\n",S);
x+=0.5}
}

#include <stdio.h>
#include <stdlib.h>

int main()
{
int i;
    int const n=20;
	int data[n]={a,b,C,D,E,f,g,h,E,q,q,A,Y,u,T,t,R,I,o,P,};
//Выводим исходный массив
    printf("Initial array: \n");
     for (i=0; i<n; i++)
	{
		printf("%d ", data[i]);
	}  
    printf("\n");

#include <stdio.h>
#include <math.h>
void main()
{double b, a, n, i;
double S=0;
printf("\n VVedite a, b, n");
scanf_s("%lf%lf%lf",&a,&b,&n);
if (b>5) 
b=4;
if (a<2) 
a=2;
{for(i=1;i<=n;++i)
S+=pow(a*b,i-1)/i*(b-i);}
printf("\nS=%f\t",S);}

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

int fact(int fct);

int main(int argc, char* argv[])
{
	int n, i;
	double x;
	double a = 0.0, b = 0.0;

	scanf("%lf", &a);
	scanf("%lf", &b);
	scanf("%d", &n);

	if(b>5.0)	b = 4.0;
	if(a<2.0)	a =2.0;
	
	for(i=1; i < n; i++)
	{
		x = x + pow(a*b, i-1) / (fact(i) * (b-i));
	}

	printf("%lf\n", x);

	return 0;
}

int fact(int fct)
{
	return (fct == 1)? 1 : fct * fact(fct-1);
}