func calculate_pi(terms: i32): f64 {
    let sum: f64 = 0;
    for (let i: i32 = 0; i < terms; i++) {
        let term: f64 = 1.0 / (2 * i + 1);
        if (i % 2 == 0) {
            sum = sum +  term;
        } else {
            sum = sum -  term;
        }
        if (i % 100000 == 0) {
 
            print(term);
        }
    }
    return sum * 4; // 确保乘以4得到正确π值
}

func main(): i32 {
    let terms: i32 = 1000000;  
    let pi: f64 = calculate_pi(terms);
    
    let output: string = "Calculated π: " + pi.toString() + " (using " + terms.toString() + " terms)";
    print(output);
    
    return 0;
}