Incorrect arithmetic output

Question

I have this piece of code that inserts marks in to the database, but the problem is that

$sql_insert=mysqli_query($conn,"INSERT INTO `marks_1c` 

(student_name,test_1,test_2,test_3,test_4,test_5,mock,teacher,subject)
VALUES('$student',
       '$test_1',
       '$test_2',
       '$test_3',
       '$test_4',
       '$test_5',
       '$mock',
       '$session',
       '$subject')")or die(mysqli_error($conn)); if($sql_insert){
    $total=($test_1+$test_2+$test_3+$test_4+$test_5)/5;
    $mock_mark=$mock*0.6;
    echo 'Marks entered for '.$student.' '.'average is '.($total*0.4)+($mock_mark);

when I run this code, it does not echo the "Marks entered for '.$student.' '.'average is" but it only displays the result of ($total*0.4)+($mock_mark).

But when, I put the multiply the ($total*0.4) and ($mock_mark), it displays the "Marks entered for '.$student.' '.'average is"

i do not understand, please help.

replace this => echo 'Marks entered for: '.$student.' average is'.(($total*0.4)+($mock_mark)); — Soni Vimalkumar
– Soni Vimalkumar, Commented Nov 14, 2016 at 8:38

Narendrasingh Sisodia · Accepted Answer · 2016-11-14 09:10:28Z

2

Following code will workout

$mark = ($total*0.4)+($mock_mark);

echo "Marks entered for ".$student." "."average is".$mark;

or

echo 'Marks entered for '.$student.' '.'average is '.(($total*0.4)+($mock_mark));

edited Nov 14, 2016 at 9:10

Narendrasingh Sisodia

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answered Nov 14, 2016 at 8:53

Arya V Nair

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Comments

nospor · Accepted Answer · 2016-11-14 08:41:47Z

1

When you do

'text' + 4

this is mathematical operation. If you want to add some number + number to text you must use () for all result, so in your example will be

echo 'Marks entered for '.$student.' '.'average is '.($total*0.4 + $mock_mark);

No we are concatenate text with some mathematical result

answered Nov 14, 2016 at 8:41

nospor

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Comments

Soni Vimalkumar · Accepted Answer · 2016-11-14 12:08:59Z

0

replace this =>

echo 'Marks entered for: '.$student.' average is'.(($total*0.4)+($mock_mark));

edited Nov 14, 2016 at 12:08

answered Nov 14, 2016 at 8:37

Soni Vimalkumar

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