檸檬的C語言初學日誌

影片連結在這裡https://youtu.be/yAaGPNWSYss

#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
    //定義一個整數變數
    int inum;
    int refer;
    while(1){
       //輸入一個整數值
       cout << "請輸入一個整數值: ";
       cin >> inum;
       for( refer = 2 ; refer <= inum ; refer++ ){
          if(refer == inum) cout << "此數是質數" << endl;
          else if(inum % refer == 0) {
                cout << "此數不是質數" << endl;
                break;
          }
          else {
               continue;
               cout << "此數是質數" << endl;
          }
       }
    }
    return 0;
    system("pause");
}

使用for迴圈
#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
    //定義一個整數變數
    int i = 1 , j = 1 , product = 1;

    for( i = 1 ; i < 10 ; i++){
        //i * j = product
        for( j = 1 ; j < 10 ; j++){
         product = i * j ;
         cout << " " << i;
         cout << "*" << j ;
         //如果 product < 10 則多加1個空格!!!
         if( product < 10 ) cout << "= " << product ;
         else cout << "=" << product ;
        }
        cout << endl;
    }
    return 0;
    system("pause");
}

---------------------------------------------------------

使用do-while迴圈(包一個for迴圈)

使用for迴圈
#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
    //定義一個整數變數
    int inum , cube , sum = 0;

    for( inum = 1 ; inum < 101 ; inum++ ){
        cube = inum * inum * inum;
        sum = sum + cube;
    }
    //輸出1~100立方值的總和 //end1是換行
    cout << "1~100立方值的總和是: " << sum << endl;
    return 0;
    system("pause");
}

-------------------------------------------------------------------------------------

使用while迴圈

#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
    //定義一個整數變數
    int inum;

    //輸入一個整數值
    cout << "請輸入一個整數值: ";
    cin >> inum;
    if( inum < 0 ){
        inum = 0 - inum;
    }
    //輸出此數的絕對值
    cout << "此數的絕對值是: " << inum << endl;
    return 0;
    system("pause");
}

--------------

<< endl 是換行的意思

課程網址點教授名字進去就可以囉

#include <stdio.h>
#include <stdlib.h>

#include<stdio.h>
#include<stdlib.h>

#include <stdio.h>
#include <stdlib.h>

正確版:

#include<stdio.h>