C/C++ 语言 Hello world

#include <stdio.h>

void main() {
    int x,i;
    ;
    scanf("%d",&x);
    if(x>y)
        printf("x大于y\n");
    else if(x<y)
        printf("x小于y\n");
    else
        printf("x等于y\n");

    ;i<=;i++)
        printf("%d\n",i);

    printf("%d\n",f(x,y));
}

int f(int i,int j){
    printf("I'm f()\n");
    *i-j;
}

#include <iostream>
using namespace std;

int f_plus(int x,int y);
int main()
{
    int x,y;
    x=;
    y=;
    if(x>y){
        cout << "x>y\n";
    }else if(x<y){
        cout << "x<y\n";
    }

    cout << f_plus(x,y);
    cout << "\n";

    ;
}

int f_plus(int x,int y){

    return x+y;
}