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stripping non numeric values from char array

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say i have an array of chars

char temp[];
strcpy(temp,"$100,000.00");

now i want to just take out all the non numeric values such as $ , and .
the string in temp is not always going to be $100,000.00 , it could be $1,000.00 or $1,000,000.00.

I tried doing something like

if temp[i]>47 && temp[i]<58 {
 then do something
}

but it seems to not filter out non numerical values. Do i just have the ascii values wrong or should i be taking a different approach to filtering out the non numerical values?
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