九九乘法表

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            int sum = 0;
            int[,] arr2 = new int[10, 10];
            for (int i = 1; i <= 9; i++)
                for (int j = 1; j <= 9; j++)
                {
                    sum = i * j;
                   
                    arr2[i, j] = sum;
                }
            for (int i = 1; i <= 9; i++)
                for (int j = 1; j <= 9; j++)
                {
                    Console.WriteLine("arr[i=" + i + ",j=" + j + "]=" + arr2[i, j]);
                }
        }
    }
}

1加到100

#include <stdio.h>
#include <conio.h>
int main()
{
int i;
int sum;
sum=0;
for (i=1;i<=100;i++)
sum=sum+i;
printf("從1加到100的總和是");
printf("%d\n", sum);
getch();
return(0);
}