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Нужно переписать эту программу с паскаля на Си , Паскаль я не понимаю, помогите пожалуйста , плачу хорошо
program simp1; 
{ integration by Simpson's method }

const tol = 1.0E-6; 
var sum,upper,lower : real;

function fx(x: real): real; 
begin 
fx:=exp(-x/2) 
end; { function fx }

function dfx(x: real): real; 
begin 
dfx:=-(exp(-x/2))/2 
end; { function fx }

procedure simps(lower,upper,tol : real; var sum : real); 
{ numerical integration by Simpson's rule } 
{ function is fx, limits are lower and upper } 
{ with number of regions equal to pieces } 
{ partition is delta_x, answer is sum }

var i : integer; 
x,delta_x,even_sum, odd_sum,end_sum, end_cor,sum1 : real; 
pieces : integer;

begin 
pieces:=2; 
delta_x:=(upper-lower)/pieces; 
odd_sum:=fx(lower+delta_x); 
even_sum:=0.0; 
end_sum:=fx(lower)+fx(upper); 
end_cor:=dfx(lower)-dfx(upper); 
sum:=(end_sum+4.0*odd_sum)*delta_x/3.0; 
repeat 
pieces:=pieces*2; 
sum1:=sum; 
delta_x:=(upper-lower)/pieces; 
even_sum:=even_sum+odd_sum; 
odd_sum:=0.0; 
for i:=1 to pieces div 2 do 
begin 
x:=lower+delta_x*(2.0*i-1.0); 
odd_sum:=odd_sum+fx(x) 
end; 
sum:=(7.0*end_sum+14.0*even_sum+16.00*odd_sum 
+end_cor*delta_x)*delta_x/15.0; 
until (sum<>sum1) and (abs(sum-sum1)<=abs(tol*sum)) 
end; { simps }
begin { main program } 
lower:=1.0; 
upper:=9.0; 
simps(lower,upper,tol,sum); 
writeln; 
writeln(chr(7),'area= ',sum) 
end.

Игорь Norikate1