1 //求和:1+2+3
+ 100
2 public class getSum {
3 public static void sums1(int temp)
4 {
5 int addResult1=0;
6 addResult1 = (1+temp)*temp/2;
7 System.out.println("addResult1===>"+addResult1);
8 }
9 public static void sums2(int temp)
10 {
11 int i;
12 int addResult2 = 0;
13 for(i=1;i<(temp+1);i++)
14 {
15 addResult2 = addResult2 + i;
16 }
17 System.out.println("addResult2===>"+addResult2);
18 }
19 public static void main(String[] args) {
20 int s = 100;
21 sums1(s);
22 sums2(s);
23 }
24 }
25

2 public class getSum {
3 public static void sums1(int temp)
4 {
5 int addResult1=0;
6 addResult1 = (1+temp)*temp/2;
7 System.out.println("addResult1===>"+addResult1);
8 }
9 public static void sums2(int temp)
10 {
11 int i;
12 int addResult2 = 0;
13 for(i=1;i<(temp+1);i++)
14 {
15 addResult2 = addResult2 + i;
16 }
17 System.out.println("addResult2===>"+addResult2);
18 }
19 public static void main(String[] args) {
20 int s = 100;
21 sums1(s);
22 sums2(s);
23 }
24 }
25
1 private void countNo(){
2 int iStart = 1;
3 int iEnd = 100;
4 int iCount = 100;
5
6 System.out.println((iStart + iEnd ) * iCount / 2);
7 }
8
9
2 int iStart = 1;
3 int iEnd = 100;
4 int iCount = 100;
5
6 System.out.println((iStart + iEnd ) * iCount / 2);
7 }
8
9
1
#include<stdio.h>
2
void main()
3

{
4
int a=0,sum=0;
5
for(a=1,a<101,a=a+1)
6
sum=sum+a;
7
printf(“%d“,sum);
8
}

2

3



4

5

6

7

8

1 #include<stdio.h>
2 void main()
3 {
4 int a=100,sum=0;
5 sum=((a+1)*a)/2;//數(shù)學(xué)公式
6 printf("%d",sum);
7 }
2 void main()
3 {
4 int a=100,sum=0;
5 sum=((a+1)*a)/2;//數(shù)學(xué)公式
6 printf("%d",sum);
7 }
1 main()
2 {
3 int sum,i;
4 i=1;
5 sum=0;
6 while(i<=100)
7 {
8 sum=sum+i;i++;
9 }
10 printf("sum=%d\n",sum);
11 }
2 {
3 int sum,i;
4 i=1;
5 sum=0;
6 while(i<=100)
7 {
8 sum=sum+i;i++;
9 }
10 printf("sum=%d\n",sum);
11 }