c:
#include<stdio.h>
int main()
{
int a=printf("Hello world!");
printf("\n");
printf("%d\n",a);
}
注:呼叫printf函數時會自動輸出到控制檯;printf的返回值是一個int,大小爲字元的個數;
c++:
#include <bits/stdc++.h>
using namespace std;
int main()
{
printf("\n%d\n",printf("Hello world!"));
}
java:
public class Main{
public static void main(String[]args){
String a="Hello world!";
System.out.println(a);
System.out.println(a.length());
}
}
注:String.length()表示字元的長度;