CodeSOD: Titration Frustration

From submitter Christoph comes a function that makes your average regex seem not all that bad, actually:

According to "What is a Titration?" we learn that "a titration is a technique where a solution of known concentration is used to determine the concentration of an unknown solution." Since this is an often needed calculation in a laboratory, we can write a program to solve this problem for us.

Part of the solver is a formula parser, which needs to accept variable names (either lower or upper case letters), decimal numbers, and any of '+-*/^()' for mathematical operators. Presented here is the part of the code for the solveTitration() function that deals with parsing of the formula. Try to read it in an 80 chars/line window. Once with wrapping enabled, and once with wrapping disabled and horizontal scrolling. Enjoy!

String solveTitration(char *yvalue){ String mreport; lettere = 0; //now we have to solve the system of equations //yvalue contains the equation of Y-axis variable String tempy = ""; end = 1; mreport = ""; String tempyval; String ptem; for (int i = 0; strlen(yvalue) + 1; ++i) { if (!(yvalue[i]=='q' || yvalue[i]=='w' || yvalue[i]=='e' || yvalue[i]=='r' || yvalue[i]=='t' || yvalue[i]=='y' || yvalue[i]=='u' || yvalue[i]=='i' || yvalue[i]=='o' || yvalue[i]=='p' || yvalue[i]=='a' || yvalue[i]=='s' || yvalue[i]=='d' || yvalue[i]=='f' || yvalue[i]=='g' || yvalue[i]=='h' || yvalue[i]=='j' || yvalue[i]=='k' || yvalue[i]=='l' || yvalue[i]=='z' || yvalue[i]=='x' || yvalue[i]=='c' || yvalue[i]=='v' || yvalue[i]=='b' || yvalue[i]=='n' || yvalue[i]=='m' || yvalue[i]=='+' || yvalue[i]=='-' || yvalue[i]=='^' || yvalue[i]=='*' || yvalue[i]=='/' || yvalue[i]=='(' || yvalue[i]==')' || yvalue[i]=='Q' || yvalue[i]=='W' || yvalue[i]=='E' || yvalue[i]=='R' || yvalue[i]=='T' || yvalue[i]=='Y' || yvalue[i]=='U' || yvalue[i]=='I' || yvalue[i]=='O' || yvalue[i]=='P' || yvalue[i]=='A' || yvalue[i]=='S' || yvalue[i]=='D' || yvalue[i]=='F' || yvalue[i]=='G' || yvalue[i]=='H' || yvalue[i]=='J' || yvalue[i]=='K' || yvalue[i]=='L' || yvalue[i]=='Z' || yvalue[i]=='X' || yvalue[i]=='C' || yvalue[i]=='V' || yvalue[i]=='B' || yvalue[i]=='N' || yvalue[i]=='M' || yvalue[i]=='1' || yvalue[i]=='2' || yvalue[i]=='3' || yvalue[i]=='4' || yvalue[i]=='5' || yvalue[i]=='6' || yvalue[i]=='7' || yvalue[i]=='8' || yvalue[i]=='9' || yvalue[i]=='0' || yvalue[i]=='.' || yvalue[i]==',')) { break; //if current value is not a permitted value, this means that something is wrong } if (yvalue[i]=='q' || yvalue[i]=='w' || yvalue[i]=='e' || yvalue[i]=='r' || yvalue[i]=='t' || yvalue[i]=='y' || yvalue[i]=='u' || yvalue[i]=='i' || yvalue[i]=='o' || yvalue[i]=='p' || yvalue[i]=='a' || yvalue[i]=='s' || yvalue[i]=='d' || yvalue[i]=='f' || yvalue[i]=='g' || yvalue[i]=='h' || yvalue[i]=='j' || yvalue[i]=='k' || yvalue[i]=='l' || yvalue[i]=='z' || yvalue[i]=='x' || yvalue[i]=='c' || yvalue[i]=='v' || yvalue[i]=='b' || yvalue[i]=='n' || yvalue[i]=='m' || yvalue[i]=='Q' || yvalue[i]=='W' || yvalue[i]=='E' || yvalue[i]=='R' || yvalue[i]=='T' || yvalue[i]=='Y' || yvalue[i]=='U' || yvalue[i]=='I' || yvalue[i]=='O' || yvalue[i]=='P' || yvalue[i]=='A' || yvalue[i]=='S' || yvalue[i]=='D' || yvalue[i]=='F' || yvalue[i]=='G' || yvalue[i]=='H' || yvalue[i]=='J' || yvalue[i]=='K' || yvalue[i]=='L' || yvalue[i]=='Z' || yvalue[i]=='X' || yvalue[i]=='C' || yvalue[i]=='V' || yvalue[i]=='B' || yvalue[i]=='N' || yvalue[i]=='M' || yvalue[i]=='.' || yvalue[i]==',') { lettere = 1; //if lettere == 0 then the equation contains only mnumbers } if (yvalue[i]=='+' || yvalue[i]=='-' || yvalue[i]=='^' || yvalue[i]=='*' || yvalue[i]=='/' || yvalue[i]=='(' || yvalue[i]==')' || yvalue[i]=='1' || yvalue[i]=='2' || yvalue[i]=='3' || yvalue[i]=='4' || yvalue[i]=='5' || yvalue[i]=='6' || yvalue[i]=='7' || yvalue[i]=='8' || yvalue[i]=='9' || yvalue[i]=='0' || yvalue[i]=='.' || yvalue[i]==',') { tempyval = tempyval + String(yvalue[i]); } else { tempy = tempy + String(yvalue[i]); for (int i = 0; i < uid.tableWidget->rowCount(); ++i) { TableItem *titem = uid.table->item(i, 0); TableItem *titemo = uid.table->item(i, 1); if (!titem || titem->text().isEmpty()) { break; } else { if (tempy == uid.xaxis->text()) { tempyval = uid.xaxis->text(); tempy = ""; } ... /* some code omitted here */ if (tempy!=uid.xaxis->text()) { if (yvalue[i]=='+' || yvalue[i]=='-' || yvalue[i]=='^' || yvalue[i]=='*' || yvalue[i]=='/' || yvalue[i]=='(' || yvalue[i]==')' || yvalue[i]=='1' || yvalue[i]=='2' || yvalue[i]=='3' || yvalue[i]=='4' || yvalue[i]=='5' || yvalue[i]=='6' || yvalue[i]=='7' || yvalue[i]=='8' || yvalue[i]=='9' || yvalue[i]=='0' || yvalue[i]=='.' || yvalue[i]==',') { //actually nothing } else { end = 0; } } } } } // simbol end if (!tempyval.isEmpty()) { mreport = mreport + tempyval; } tempyval = ""; } return mreport;}

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