How to resize the block of a column

I have a single column of a file having many blocks and the blocks are separated by the > symbol.

I want to resize all blocks to the same highest length by appending zero below them.

My file is given below:

file.txt

>
1.0
2.4
3.5
4.5
>
1.2
3.3
>
2.4
2.5
2.5

and my expected output is given below

>
1.0
2.4
3.5
4.5
>
1.2
3.3
0.0
0.0
>
2.4
2.5
2.5
0.0

I am trying to write a script, but it fails:

#!/bin/sh
for file in `cat file.txt`
do
    awk '{print $1+0}' $file
done

Answer

Based on your shown samples, could you please try following. Written and tested with shown samples in GNU awk.

awk '
FNR==NR{
  if($0~/^>/){
     max=(max>val?max:val)
     val=""
     next
  }
  val++
  next
}
/^>/{
  if(FNR>1){
    while(count++<max){ print "0" }
  }
  count=""
  print
  next
}
{
  print
  count++
}
END{
  while(count++<max){ print "0" }
}'  Input_file  Input_file

For shown samples output will be as follows.

>
1.0
2.4
3.5
4.5
>
1.2
3.3
0
0
>
2.4
2.5
2.5
0

Explanation: Adding detailed explanation for above.

awk '                                   ##Starting awk program from here.
FNR==NR{                                ##Checking condition if FNR==NR here.
  if($0~/^>/){                          ##Checking condition if line starts from > then do following.
     max=(max>val?max:val)              ##Assigning max value as per max>val then assign it to max else keep it as val value.
     val=""                             ##Nullify val here.
     next                               ##next will skip all further statements from here.
  }
  val++                                 ##Increasing val with 1 here.
  next                                  ##next will skip all further statements from here.
}
/^>/{                                   ##Checking condition if line starts with >
  if(FNR>1){                            ##Checking condition if this is not first line.
    while(count++<max){ print "0" }     ##Printing 0 till count is equal to max.
  }
  count=""                              ##Nullify count here.
  print                                 ##Printing current line here.
  next                                  ##next will skip all further statements from here.
}
{
  print                                 ##Printing current line here.
  count++                               ##Increasing count with 1 here.
}
END{                                    ##Starting END block of this program from here.
    while(count++<max){ print "0" }     ##Printing 0 till count is equal to max.
}' Input_file Input_file                ##Mentioning Input_file names here.