BABAR C++ Course Running the Examples - HEPHY

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Runtime Array SizeLine fit exampleIn C++, one can dynamically allocate arrays• new is an operator that returns a pointer to the newlycreated array• note use of n; a variable• not the same as Fortran’swhere the calling routine “owns” the memory• in C, one doesfloat* x = new float[n];SUBROUTINE F(X,N)DIMENSION X(N)float *x = (float *)malloc( n*sizeof(float) )In C++, to delete a dynamically allocated array oneuses the delete operatordelete [] x;Part 1(ch2/linefit.C)#include void linefit() {// Create arrays with the desired number of elementint n;cin >> n;float* x = new float[n];float* y = new float[n];// Read the data pointsfor (int i = 0; i < n; i++) {cin >> x[i] >> y[i];}// Accumulate sums Sx and Sy in double precisiondouble sx = 0.0;double sy = 0.0;for (i = 0; i < n; i++) {sx += x[i];sy += y[i];}• in C one uses the free() functionfree(x);BABAR C++ Course 50 Paul F. KunzBABAR C++ Course 51 Paul F. Kunz
Line fit continuedCharacter StringsPart 2 (ch2/linefit.C)// Compute coefficientsdouble sx_over_n = sx / n;double stt = 0.0;double b = 0.0;for (i = 0; i < n; i++) {double ti = x[i] - sx_over_n;Character strings are special case of array andarray initializationchar hello1[] = { ’H’, ’i’ };The above is too tedious, so use double quoteschar hello2[] = "Hi";}stt += ti * ti;b += ti * y[i];}b /= stt;double a = (sy - sx * b) / n;delete [] x;delete [] y;cout
Page 1 and 2: BABAR C++ CourseRunning the Example
Page 3 and 4: C++ Input and OutputMore on I/OIntr
Page 5 and 6: Declaring types and initializingTyp
Page 7 and 8: Relational OperatorsLogical operato
Page 9 and 10: Assignment operatorsOperator Preced
Page 11 and 12: Coding Styleswhile loopC/C++ is fre
Page 13 and 14: do-while Examplefor loopSnippet fro
Page 15 and 16: ArraysExample Code and a TestA coll
Page 17 and 18: Plan of the dayFunctionsFunctionsPo
Page 19 and 20: Header files used with definitionHe
Page 21 and 22: Functions in CHeader FilesFunction
Page 23 and 24: Pointers and ArraysPointer Arithmet
Page 25: Progression towards C++ styleExampl
Page 29 and 30: Formal ArgumentsReferencesConsider(
Page 31 and 32: More on declarationsconst PointerWe
Page 33 and 34: Inline FunctionsSummarySometimes, t
Page 35 and 36: ThreeVectorUsing a class objectCLHE
Page 37 and 38: Use of private keywordInitializing
Page 39 and 40: Access member functionsInline acces
Page 41 and 42: C++ designHomeworkC++ style• effi
Page 43 and 44: Member InitializersFunction Return
Page 45 and 46: Operator Function ImplementationCom
Page 47 and 48: Need Symmetric Operator FunctionsTh
Page 49 and 50: SummaryLevels of Abstraction in Phy
Page 51 and 52: Plan of the daySimpleFloatArray Cla
Page 53 and 54: Constructor Implementationscopy Imp
Page 55 and 56: operator= Member FunctionAssignment
Page 57 and 58: Key pointsClass explosion?• shoul
Page 59 and 60: Function TemplatesList or Array?Rem
Page 61 and 62: The Node and List classesProblemsDe
Page 63 and 64: IteratorsIterators++CompareSimpleAr
Page 65 and 66: Standard Template Library (STL)Feat
Page 67 and 68: Recall our test programPossible 4-V
Page 69 and 70: Use of Lorentz VectorMemory modelCo
Page 71 and 72: Even more of ImplementationWhat’s
Page 73 and 74: Class HierarchyObject HierarchyIn c
Page 75 and 76: Class hierarchyLockable classFor bo
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The classes involvedmain.ccFrom CLH
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Do particle type identificationIden
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Finally, find all B 0 -> D * D *Sum
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Particle Data Table classLayoutHist
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PDTEntry classDecayMode classParts
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Gismo HistorySome Gismo ClassesVers
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Surface classPlane classPart of the
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Gismo VolumePart of implementationP
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Back to implementationFollowing the
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As expectedVirtual destructorIn Cir
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