Question

Дан массив f[10] заполненный по формуле в файле a.txt, определить сумму четных элементов и вывести ее в входной файл b.txt Формула: y=2sin(x)+1

Answer 1

var t1,t2:text;

begin

assign(t1,"a.txt");

assign(t2,"b.txt");

reset(t1);

rewrite(t2);

var i:byte:=0;

var a,sum:integer;

sum:=0;

while not eof(t1) do begin

readln(t1,a);

inc(i);

if ((i+1) mod 2=0) then sum+=a;

end;

writeln(t2,sum);

close(t1);

close(t2);

end.

Answer 2

To calculate the sum of even elements of the array f[10] filled with values from the formula y = 2sin(x) + 1, you'll need to follow these steps:

1. Read the values from the file "a.txt" and calculate the corresponding array f[10] using the given formula.
2. Find the sum of even elements in the array.
3. Write the result to the file "b.txt".

Here's a Python code to accomplish this task:

pythonCopy code
import math

# Function to calculate the value of y = 2sin(x) + 1 for a given x
def calculate_y(x):
    return 2 * math.sin(x) + 1

# Read data from file 'a.txt' and calculate the array f[10]
with open('a.txt', 'r') as file_a:
    data = file_a.readlines()
    f = [calculate_y(float(x)) for x in data]

# Calculate the sum of even elements in the array
sum_even = sum(x for x in f if x % 2 == 0)

# Write the result to file 'b.txt'
with open('b.txt', 'w') as file_b:
    file_b.write(str(sum_even))

print("Sum of even elements:", sum_even)

Make sure to put your values for x (one value per line) in the "a.txt" file before running this code. After execution, the sum of even elements will be written to the "b.txt" file, and it will also be printed to the console.