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Add string to parentheses

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# 1  
Add string to parentheses

Suppose I have this code :

int main () {   int i = NULL;  /* incorrect */   return 0; }

and I want to put the word
between the two parentheses
like this :

int main (void) {   int i = NULL;  /* incorrect */   return 0; }

which command is used to do it in Linux ?
# 2  
sed can do the substitution

If you have the code in

, try

sed -e "s/()/(void)/" /tmp/test.c

to see/preview it and

sed -i.bak -e "s/()/(void)/" /tmp/test.c

for an in-place substitution within the file. If anything goes wrong,

should have the original that you started with.
# 3  
What keeps you from using a plain text editor like vi, emacs, joe, ed, or ex?

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