How to printf float data as a special format?

[young]

I have a string like str=" 267.8765 ";

I want to output them as something like "267.88'

I used f=atof(str);

but I do not know how to print out them correctly

any help please?

[young]

I found out, It is printf("%6.2f",data);

I had something wrong in atof(); I do not know why
str=" 267.8765 ";
f=atof(str);

f just return 0.000000;

any advice?

[young]

It was not the fault of atof(str); it is the string itself.

[young]

in the string I have some space like this " 236.75674", it was the space that causing the error.

[young]

The question is now becomes how to convert " 352.7356" into "352.7356", please gave some advice. so far this is the big problem, before I try to avoid it, but there is not by pass after I struggled a while.

[dyeatman]

Hint:

One way to clean up the string is to try something like this...

for(i=1;i<strlen(str);i++)
if (isamoung(str[i],'1234xxxx.')) valid_num+=str[i];