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# pr7

starm100 Dec 4th, 2018 (edited) 20 Never
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1. function f(x)
2.     real::f,x
3.     f=sqrt(x**2+x+1)-sqrt(x**2-x+1)
4. end function
5.
6.
7. program pr7
8. integer::l,n,i,j,k
9. real::x0,xk,h,sup=-(10**5),inf=10**5,u,v,t
10. real,dimension(1:100)::xi,yi !В примере из учебника размер массивов задан, можно сделать динамические
11. print*, 'input x0,xk,h,l'
13. write(*,*) 'i      x      f(x)'
14. n=nint(((xk-x0)/h+0.5)+1)
15. do i=1,n
16.     u=x0+(i-1)*h !из примера
17.     v=f(u)       !зачем-написано в книге
18.     xi(i)=u
19.     yi(i)=v
20.     write(*,'(I5,2(f7.3))') i,u,v
21.     if (sup<v) then
22.         sup=v
23.     end if
24.     if (inf>v) then
25.         inf=v
26.     end if
27. end do
28. t=(sup-inf)/l
29. write(*,10) sup,inf,t
30. 10 format (2x,"sup=",f7.3,2x,"inf=",f7.3,2x,"t=",f7.3/7x,"x")
31. do i=1,n
32.     k=nint((yi(i)-inf)/t)
33.     write(*,'(f7.3,"-"\)') xi(i)
34.     write(*,'(a\)') repeat(" ",k)
35.     write(*,'(a1)') '*'
36. end do
37. write(*,'(a,a\)') repeat(" ",8), repeat("|",nint((yi(n)-inf)/t)+1)
38. write(*,*) 'y'
39. write(*,'(2x,f7.3\)') inf
40. write(*,'(a,f7.3)') repeat(" ",nint((yi(n)-inf)/t)),sup
41. end
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