九九乘法表

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            int[,] array = new int[10, 10];
            int sum=0;
            for(int i=1;i<=9;i++)
                for (int j = 1; j <= 9; j++)
                {
                    sum = i * j;

                    Console.WriteLine(i + "*" + j + "=" + sum);
                }
        }
    }
}

1+2+......+100

#include <stdio.h>

#include <stdlib.h>

int main(int argc, char *argv[])
{
 {
    int i;
    int tol=0;
    for( i = 1 ; i <= 100 ; ++i )
    {
         tol+=i;

         }

       printf("%d\n",tol);

 }

 

  system("PAUSE");

  return 0;

}