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The problem will be solved if you write the following: [COLOR="Green"]case PLUS: if(expr.substr(0,i) != "") return evaluateExpr(expr.substr(0,i))+evaluateExpr(expr.substr(i+1,expr.length()-i-1)); else return evaluateExpr(expr.substr(i+1,expr.length()-i-1)); case MINUS: if(expr.substr(0,i) != "") return evaluateExpr(expr.substr(0,i))-evaluateExpr(expr.substr(i+1,expr.length()-i-1)); else return -evaluateExpr(expr.substr(i+1,expr.length()-i-1)); //the number is negative[/COLOR]
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