problem in file operation.. in c...

i hava a file which has both text and numbers.. my requirement is to take the numbers alone and process.. how to take the numbers alone leaving the text untouched?... for sample i have given the file details...

Frequency SignalLevel FieldLevel AnalyzerLevel
80 -20.82 5.22 -18.8
80.8 -20.4 5.2 -18.8
81.608 -20.17 5.22 -19
82.424 -20.17 5.2 -19.3
83.248 -20.15 5.21 -19.5
84.081 -20.13 5.22 -19.7
84.922 -20.05 5.23 -19.7
85.771 -20.06 5.21 -19.8
86.629 -20.32 5.21 -19.9
87.495 -20.86 5.2 -20.3
88.37 -21.45 5.2 -20.9
89.253 -21.69 5.2 -21.3
90.146 -21.44 5.21 -21.6


as you can see there are four type of datas(details) available i have to seperately take the informations.. how to proceed with?.... i could able to read and write only could not able to seperate the datas.. as i am new to c programming dont know how to extract the informations...

pls help me...

hi

as of your data, you can deal some logic with compare with string data type and int and float and double,

stringsl always less than 256, and int.

and you have to think and search internet for logic


regards

ship