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awk script to check and throw error for multiplication result

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# 1  
Old 05-08-2018
awk script to check and throw error for multiplication result
I need to multiply column1 and column3 data and need to compare it with column5. Need to check multiplication and Throw error if result is greater or less than column5 values, though difference of +/- 2 will be ok

Ex - if column1 has 2.4 and column3 has 3.5, it will be ok if column5 have value in range from row1(6.4 to 10.4), row2(248 to 252), row3(22634.8 to 22638.8) Only need to check multiplication result and Throw error. File has header too, but need to skip header while validating it.

Correct File

Code:
a|b|c|d|e
2.4||3.5||8.4
5||50||250
6.55||3456||22636.8
Correct file

Code:
a|b|c|d|e
2.4||3.5||7.4
5||50||251
6.55||3456||22635.8

Worng file :

Code:
a|b|c|d|e
2.4||3.5||6.3
5|50|247
6.55||3456||22634.4

Worng file

Code:
a|b|c|d|e
2.4||3.5||10.5
5||50||253
6.55||3456||22638.9

Below is code im trying :

This seems to be ok to check result greater than 2
Code:
if ($5 > $1 * $3 + 2 ) {print "Error 401: column1 and colmn3 does not match with column5,Field position 5, Linenumber:"NR,$0}

But below is not working to check if result is less than 2 and throwing error if result of multiplication is equal to $5
Code:
if ($5 < $1 * $3 + 2 ) {print "Error 402: column1 and colmn3 does not match with column5,Field position 5, Linenumber:"NR,$0}

# 2  
Old 05-08-2018
Change the plus to a minus in the Error 402 check condition.
# 3  
Old 05-08-2018
Hi rdtrx1,
Have done, but not working.
please suggest
# 4  
Old 05-08-2018
WHAT and HOW "not working"? The better the info you post, the sooner and better results.

Try to paranthesize the arithmetic expression. Try like
Code:
awk '
                        {L = 0}
$5 > ($1 * $3 + 2)      {L = 1}
$5 < ($1 * $3 - 2)      {L = 2}
L                       {print "Error", L + 400, ": column1 and colmn3 does not match with column5,Field position 5, Linenumber:" NR, $0}
' FS="|" file

# 5  
Old 05-09-2018
Hi Rudic,

By using the below code getting below wrong error code output
As multiplication result of $1*$3 is correct in $5. So i should not supposed to get error.
but still it is showing output as pasted below.
Ideally i should get error message only when multiplication result of $1 andd $3 is not correct and have deviation of more than +/- 2 when compared with $5


Code:
#!/bin/bash
awk -F"|" -v OFS="|" 'NR>1
                        {L = 0}
$5 > ($1 * $3 + 2)      {L = 1}
$5 < ($1 * $3 - 2)      {L = 2}
L                       {print "Error", L + 400, ": column1 and colmn3 does not match with column5,Field position 5, Linenumber:" NR, $0}
' a1.txt > b1.txt

Wrong output

Code:
Error|401|: column1 and colmn3 does not match with column5,Field position 5, Linenumber:1|a|b|c|d|e
2.4||3.5||8.4
5||50||250
6.55||3456||22636.8

# 6  
Old 05-09-2018
It IS absolutely correct, as "a" * "c" + 2 is less than "e".
You might want to exclude the header line?
# 7  
Old 05-10-2018
Hi Rudic,

For the below row, multiplication result of $1 * $3 is equal to $5, so i should not get an error message, but im getting with your code
Error should display only for the bad records rows with header in another file , those have multiplication result deviation of more than +/- 2.
Code:
a|b|c|d|e
2.4||3.5||8.4

Also i am using below code(.awk) to do the same thing with below input file

Code:
BEGIN { FS="|" }
NR>1 { print $0 "\tis " (abs($5-($1*$3)) > 2 ? "bad" : "good") }
function abs(val) { return (val<0 ? -val : val) }

Executing as awk -f tst.awk file

Input

Code:
a|b|c|d|e
2.4||3.5||6.6
5||50||249
6.55||3456||22635.7
2.4||3.5||6.3
5|50|247
6.55||3456||22634.4


could you please help.
So with the above code i want to print only bad records in another file along with header and row number and not the both good and bad records.
Expected output

Code:
a||b||e
2.4||3.5||6.3   is bad, line number 1
5|50|247        is bad, line number 2
6.55||3456||22634.4     is bad, line number 3
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