Print sum and relative value of the sum

Shell Programming and Scripting
1

Hi

i data looks like this:

student 1 
Subject1 45 55 
Subject2 44 55 
Subject3 33 44 
//
student 2 
Subject1 45 55 
Subject2 44 55 
Subject3 33 44

i would like to sum $2, $3 (marks) and divide each entry in $2 and $3 with their respective sums and print for each student as $4 and $5.

desired output:

Student 1
Subject1	45	55	0.368852459	0.357142857
Subject2	44	55	0.360655738	0.357142857
Subject3	33	44	0.270491803	0.285714286
//
student 2 
Subject1	45	55	0.368852459	0.357142857
Subject2	44	55	0.360655738	0.357142857
Subject3	33	44	0.270491803	0.285714286

Please help me with awk or perl

Many thanks in advance

2

Huh?

Student 1
S1, a, b
S2, c, d
S3, e, f

What are you trying to do?

3

i want

sum (a+c+e) = ace
sum (b+d+f) = bdf

and

a/ace, c/ace, e/ace
b/bdf, d/bdf, f/bdf

sorry for not being clear. hope it is clear now.