# Split a calculation into calculation tokens

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 Submitted on: 11/8/2016 10:54:37 PM By: Zehel Level: Advanced User Rating: Unrated Compatibility: Java (JDK 1.4), Java (JDK 1.5) Views: 2764

Splits a calculation into calculation tokens

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 ``` //************************************** // Name: Split a calculation into calculation tokens // Description:Splits a calculation into calculation tokens // By: Zehel //************************************** //••••----------•••• private String[] zCalcSplit44(final char[] inChrRy) { // this splits a calculation into further calculation tokens // EXAMPLE:: (23÷-6×4×-9÷2) will return {"23÷-6", "-6×4", "4×-9", "-9÷2"} // *it also keeps track of operators inline LtoR via oprtrLst // *does not use regex, does not fail!!! // zandidigital1@gmail.com final int len = inChrRy.length; int dx = 1, inDx = 0, lstOprtrDx = 0; char lstChr = '*'; Boolean isStrt = true, hasOprts = false, isOprtr = false, oprtrTrp = false, lpTrp = false, skpTrp = true; if(inChrRy[0] == '÷' || inChrRy[0] == '×') { return new String[]{"##!"};} while(dx < len) { if(inChrRy[dx] == '÷' || inChrRy[dx] == '×' || inChrRy[dx] == '+' || inChrRy[dx] == '-') { hasOprts = true;} dx++;} String[] retStrRy = null; if(hasOprts) { ArrayList eqtLst = new ArrayList(); ArrayList oprtrLst = new ArrayList(); StringBuilder sb1 = new StringBuilder(); StringBuilder sb2 = new StringBuilder(); dx = 0; while(dx < len) { if(isStrt) { isStrt = false; if(inChrRy[dx] == '-' || inChrRy[dx] == '0' || inChrRy[dx] == '1' || inChrRy[dx] == '2' || inChrRy[dx] == '3' || inChrRy[dx] == '4' || inChrRy[dx] == '5' || inChrRy[dx] == '6' || inChrRy[dx] == '7' || inChrRy[dx] == '8' || inChrRy[dx] == '9') { sb1.append(String.valueOf(inChrRy[dx]));} else if(inChrRy[dx] == '÷' || inChrRy[dx] == '×') { return new String[]{"##!"};}} else { if(inChrRy[dx] == '×') { if(oprtrTrp) { return new String[]{"##!"};} else { if(!lpTrp) { sb1.append(String.valueOf(inChrRy[dx]));} isOprtr = true; oprtrTrp = true; oprtrLst.add(1);}} else if(inChrRy[dx] == '÷') { if(oprtrTrp) { return new String[]{"##!"};} else { if(!lpTrp) { sb1.append(String.valueOf(inChrRy[dx]));} isOprtr = true; oprtrTrp = true; oprtrLst.add(2);}} else if(inChrRy[dx] == '+') { if(lstChr == '×' || lstChr == '÷' || lstChr == '-') { isOprtr = false; oprtrTrp = false;} else { if(!oprtrTrp && !lpTrp) { sb1.append(String.valueOf(inChrRy[dx]));} isOprtr = true; oprtrTrp = true; oprtrLst.add(3);}} else if(inChrRy[dx] == '-') { if(oprtrTrp) { if(lstChr == '+' || lstChr == '-') { return new String[]{"##!"};} else if(lstChr == '×' || lstChr == '÷') { if(!lpTrp) { sb1.append(String.valueOf(inChrRy[dx]));} else { sb2.append(String.valueOf(inChrRy[dx]));} isOprtr = false; oprtrTrp = false;}} else { if(!lpTrp) { sb1.append(String.valueOf(inChrRy[dx]));} isOprtr = true; oprtrTrp = true; oprtrLst.add(4);}} else if(inChrRy[dx] == 'E' || inChrRy[dx] == '.' || inChrRy[dx] == '0' || inChrRy[dx] == '1' || inChrRy[dx] == '2' || inChrRy[dx] == '3' || inChrRy[dx] == '4' || inChrRy[dx] == '5' || inChrRy[dx] == '6' || inChrRy[dx] == '7' || inChrRy[dx] == '8' || inChrRy[dx] =='9') { if(!lpTrp) { sb1.append(String.valueOf(inChrRy[dx]));} else { sb2.append(String.valueOf(inChrRy[dx]));} isOprtr = false; oprtrTrp = false;} if(isOprtr) { if(skpTrp) { skpTrp = false; lpTrp = true;} else { if(lpTrp) { lstOprtrDx = dx; eqtLst.add(sb1.toString() + sb2.toString()); sb1 = new StringBuilder(sb2.toString() + String.valueOf(inChrRy[dx])); sb2 = new StringBuilder();}}}} lstChr = inChrRy[dx]; dx++; if(dx == len) { inDx = lstOprtrDx+1; sb2 = new StringBuilder(); while(inDx < len) { sb2.append(String.valueOf(inChrRy[inDx])); inDx++;} eqtLst.add(sb1.toString() + sb2.toString());}} retStrRy = new String[eqtLst.size()]; for(int z = 0; z < eqtLst.size(); z++) { retStrRy[z] = eqtLst.get(z);}} else { /* no need to split here, just return what came in toString(); */} return retStrRy;} //••••----------••••```

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11/9/2016 12:35:00 AMZehel

You will need to add just after isStrt = false a inChrRy index check for == '.', a decimal point. Sorry about that, all else of it good to go.
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11/9/2016 8:44:21 PMZehel

If you need check for other things like "005" or "0.÷", etc. you would add more else ifs after if(dx == len) checking lstChr with current char, inChrRy. Easily done, and just add another boolean as strtTrp that gets falses at the very end of the main while so it doesn't reach for a index of -1 after start split catch was a decimal or -
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