/* calc.js */

/* ---------------------- grobal変数 ----------------------------- */
g_total = 0;
g_mark = '\0';
g_flg = false;

/* --------------------------------------------------------------- */
function calc()		/* 計算処理 */
{
	next = parseFloat(document.cal.out.value);
	
	if( (g_mark == '+') && (g_flg != true) )
	{
		g_total += next;
	}
	else if( (g_mark == '-') && (g_flg != true) )
	{
		g_total -= next;
	}
	else if( (g_mark == '*') && (g_flg != true) )
	{
		g_total *= next;
	}
	else if( (g_mark == '/') && (g_flg != true) )
	{
		g_total /= next;
	}
	else
	{
		g_total = next;
	}
	
	g_flg = true;
	document.cal.out.value = String(g_total);
}

function out_num(num)		/* number表示処理 */
{
	data = document.cal.out.value;
	
	if( data == '0' || g_flg == true )
	{
		if( num == '.' )
		{
			document.cal.out.value = '0'.concat(num);	/* 文字列の連結 */
		}
		else
		{
			document.cal.out.value = num;
		}
		
		g_flg = false;
	}
	else
	{
		document.cal.out.value = data.concat(num);
	}
}


/* ------------------------ calc-key ------------------------------ */
function add()		/* +押下時 */
{
	calc();
	g_mark = '+';
}

function down()		/* -押下時 */
{
	calc();
	g_mark = '-';
}

function mlt()		/* *押下時 */
{
	calc();
	g_mark = '*';
}

function div()		/* /押下時 */
{
	calc();
	g_mark = '/';
}

function equ()		/* =押下時 */
{
	g_flg = false;
	calc();
	g_mark = '\0';
}

/* ----------------------- number-key ----------------------------- */
function key0()		/* 0押下時 */
{
	key = '0';
	out_num(key);
}

function key1()		/* 1押下時 */
{
	key = '1';
	out_num(key);
}

function key2()		/* 2押下時 */
{
	key = '2';
	out_num(key);
}

function key3()		/* 3押下時 */
{
	key = '3';
	out_num(key);
}

function key4()		/* 4押下時 */
{
	key = '4';
	out_num(key);
}

function key5()		/* 5押下時 */
{
	key = '5';
	out_num(key);
}

function key6()		/* 6押下時 */
{
	key = '6';
	out_num(key);
}

function key7()		/* 7押下時 */
{
	key = '7';
	out_num(key);
}

function key8()		/* 8押下時 */
{
	key = '8';
	out_num(key);
}

function key9()		/* 9押下時 */
{
	key = '9';
	out_num(key);
}

function key_dot()		/* "."押下時 */
{
	key = '.';
	out_num(key);
}

/* ---------------------------------------------------------------- */
function rst()		/* C押下時 */
{
	/* global変数初期化 */
	g_total = 0;
	g_mark = '\0';
	g_flg = false;
	
	document.cal.reset();	/* リセット */
}