c# - Why are the calculations in my calculator not correct? -
for c# class, required program simple calculator performs basic mathematical operations(add, subtract, multiply, divide). followed professor's video , program works fine. subtract command seems add - in front of result. divide command results in way off. doing wrong?
example:
123+2 = 125 (as should) 123 - 2 = -121 124 / 2 = 0.0161290322580645 12.4 * 10 = 124 (correct) here code:
public partial class form1 : form { string operand = "", operation = "", memory = ""; public form1() { initializecomponent(); } private void btnnum1_click(object sender, eventargs e) { txtoutput.text += "1"; } private void btnnum2_click(object sender, eventargs e) { txtoutput.text += "2"; } private void btnnum3_click(object sender, eventargs e) { txtoutput.text += "3"; } private void btnnum4_click(object sender, eventargs e) { txtoutput.text += "4"; } private void btnnum5_click(object sender, eventargs e) { txtoutput.text += "5"; } private void btnnum6_click(object sender, eventargs e) { txtoutput.text += "6"; } private void btnnum7_click(object sender, eventargs e) { txtoutput.text += "7"; } private void btnnum8_click(object sender, eventargs e) { txtoutput.text += "8"; } private void btnnum9_click(object sender, eventargs e) { txtoutput.text += "9"; } private void btnnum0_click(object sender, eventargs e) { txtoutput.text += "0"; } private void btndec_click(object sender, eventargs e) { if (txtoutput.text.indexof(".") == -1) { txtoutput.text += "."; } } private void btnnegpos_click(object sender, eventargs e) { if (txtoutput.text.indexof("-") == -1) { txtoutput.text = "-" + txtoutput.text; } else { txtoutput.text = txtoutput.text.substring(1, (txtoutput.text.length - 1)); } } private void execute() { if (operation == "+") { operand = convert.tostring(convert.todouble(txtoutput.text) + convert.todouble(operand)); } if (operation == "-") { operand = convert.tostring(convert.todouble(txtoutput.text) - convert.todouble(operand)); } if (operation == "*") { operand = convert.tostring(convert.todouble(txtoutput.text) * convert.todouble(operand)); } if (operation == "/") { operand = convert.tostring(convert.todouble(txtoutput.text) / convert.todouble(operand)); } } private void btnadd_click(object sender, eventargs e) { if (operand == "") { operand = txtoutput.text; } else { execute(); } operation = "+"; txtoutput.text = ""; } private void btnsubtract_click(object sender, eventargs e) { if (operand == "") { operand = txtoutput.text; } else { execute(); } operation = "-"; txtoutput.text = ""; } private void btnmultiply_click(object sender, eventargs e) { if (operand == "") { operand = txtoutput.text; } else { execute(); } operation = "*"; txtoutput.text = ""; } private void btndivide_click(object sender, eventargs e) { if (operand == "") { operand = txtoutput.text; } else { execute(); } operation = "/"; txtoutput.text = ""; } private void btnclear_click(object sender, eventargs e) { txtoutput.text = ""; operand = ""; operation = ""; } private void form1_load(object sender, eventargs e) { } private void btnequals_click(object sender, eventargs e) { if (operation == "+") { txtoutput.text = convert.tostring(convert.todouble(txtoutput.text) + convert.todouble(operand)); } if (operation == "-") { txtoutput.text = convert.tostring(convert.todouble(txtoutput.text) - convert.todouble(operand)); } if (operation == "*") { txtoutput.text = convert.tostring(convert.todouble(txtoutput.text) * convert.todouble(operand)); } if (operation == "/") { txtoutput.text = convert.tostring(convert.todouble(txtoutput.text) / convert.todouble(operand)); } operand = ""; operation = ""; } private void btnbackspace_click(object sender, eventargs e) { txtoutput.text = ""; } } thanks time.
you're getting result 2 / 124 = 0.0161290322580645
invert dividend , divisor ;)
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