Sum Problem --JAVA
阿新 • • 發佈:2018-12-17
題目:
Hey, welcome to HDOJ(Hangzhou Dianzi University Online Judge). In this problem, your task is to calculate SUM(n) = 1 + 2 + 3 + ... + n.
Input
The input will consist of a series of integers n, one integer per line.
Output
For each case, output SUM(n) in one line, followed by a blank line. You may assume the result will be in the range of 32-bit signed integer.
Sample Input
1 100
Sample Output
1 5050
題意:
給你一個數字n,求出1到n的和,
注意格式,每個結果後面有一個空行。
程式碼如下:
JAVA:
import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner input=new Scanner(System.in); int n,a,s; while(input.hasNext()) { n=input.nextInt(); s=0; for(int i=1;i<=n;i++) { s+=i; } System.out.println(s); System.out.println(); } } }
C++:
#include<stdio.h>
int main()
{
int i,n;
while(~scanf("%d",&n))
{
int sum=0;
for(i=0;i<=n;i++)
{
sum=sum+i;
}
printf("%d\n",sum);
printf("\n");
}
return 0;
}