C++ PROGRAMMING LANGUAGE

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４　簡単な演算処理
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+ 加算　total=cost + tax;
- 減算　change=payment -total;
* 乗算　tax=cast*tax_rate;
/ 除算　average=total/count;
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#include <iostram.h>
void main(void)
{
cout << "5" + 7 = " << 5 + 7 << endl;//文字列の後に計算結果を表示
cout << "12 - 7 = " << 12 - 7 << endl;
cout << "1,2345 * 2 = " << 1.2345 * 2 << endl;
cout << " 15 / 3 = " << 15 / 3 << endl;
}
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c:\showmath <enter>
5 + 7 = 12
12 - 7 = 5
1.2345 * 2 = 2.469
15 / 3 = 5
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変数同士を計算することもできます。
その計算結果をさらに変数に格納
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#include <iostream.h>
void main(void)
{
	float cost = 15.00;		//float型のそれぞれの変数に値を代入
	float sales_tax = 0.06;
	float amount _paid = 20.00;
	float tax, change, total;

	tax = cost * sales_tax;	 	//cost とsales_taxの計算結果をtaxに代入
	total = cost + tax;		//cost とtaxの計算結果をtotalに代入
	change = amount_paid - total;	//amount_paid とtotalの結果をchangeに代入

	cout << "Item Cost: $" << cost << "\tTax: $" << tax <<
		"\tTotal: $" << total << endl;	//\tは　水平タブのこと

	cout << "Customer change: $" << change << endl;
}
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c:\mathvars <enter>
Item Cost: &15.5	Tax:0.93 Total: $16.43
Customerchange: $3.57
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#include <iostream.h>
void main(void)							//ここから始まる
{
	float cost = 15.00;				// costに15.00を代入
	float sales_tax = 0.06;				//sales_taxに0.06を代入
	float amount _paid = 20.00;			//amountに20.00を代入
	float tax, change, total;		//float型のtax,change,totalを準備

	tax = cost * sales_tax;		//costの値掛けるsales_taxの値をtaxに代入
	total = cost + tax;		//costの値足すtaxの値をtotalに代入
	change = amount_paid - total;	//amount_paid引くtotalの値をchangeに代入

	cout << "Item Cost: $" << cost << "\tTax: $" << tax <<//"\t"は水平タブ
		"\tTotal: $" << total << endl;		//endl;で改行

	cout << "Customer change: $" << change << endl;	
							//coutでそれぞれを出力
}
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c:\mathvars <enter>
Item Cost: &15.5	Tax:0.93 Total: $16.43
Customerchange: $3.57
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