C：长长总是64位

64位长长整型的特点及应用

cpp
#include 
using namespace std;
int main() {
    long long num1 = 1234567890123456789;
    long long num2 = 9876543210987654321;
    long long sum = num1 + num2;
    cout << "Sum: " << sum << endl;
    return 0;
}

cpp
#include 
using namespace std;
int main() {
    long long fileSize = 1024 * 1024 * 1024 * 10; // 10GB
    cout << "File Size: " << fileSize << " bytes" << endl;
    return 0;
}

cpp
#include 
#include 
using namespace std;
int main() {
    long long timestamp1 = 1631075055; // 时间戳1
    long long timestamp2 = 1631075065; // 时间戳2
    long long timeDiff = timestamp2 - timestamp1;
    cout << "Time Difference: " << timeDiff << " seconds" << endl;
    return 0;
}