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- int fi = str.indexOf("(", 1);
- if( fi!=-1 ){
- String function_name = str.substring(0,fi);
- int epi = str.length()-1;
- String parameter = str.substring(fi+1,epi);
- if( function_name.equals("sqrt") ){
- return Math.sqrt( calc(parameter) );
- }
- }
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