判断题库

int main() {
    ofstream fout("data.txt");
    fout << 10 << " " << 20 << endl;
    fout << 30 << " " << 40;
    fout.close();
 
    ifstream fin("data.txt");
    int a, b, c, d;
    fin >> a >> b >> c >> d;
    fin.close();
 
    cout << a + b + c + d;
    return 0;
}

#include <iostream>
using namespace std;
 
int calculate(int x, int y = 10);
 
int main() {
    cout << calculate(5);  // 调用1
    return 0;
}
 
int calculate(int x, int y) {
    return x * y;
}
 
int calculate(int x) {  // 重载函数
    return x * 2;
}

void sort(int a[], int n) {
    for (int i = 1; i < n; i++) {
        int x = a[i];
        int j = i - 1;
        while (j >= 0 && a[j] > x) {
            a[j + 1] = a[j];
            j--;
        }
        a[j + 1] = x;
    }
}

int n = 10;
int f[20];
f[0] = 0;
f[1] = 1;
for (int i = 2; i <= n; i++)
    f[i] = f[i - 1] + f[i - 2];