// Example displaying two histograms and their ratio. void ratioplot() { // Define two gaussian histograms. Note the X and Y title are defined // at booking time using the convention "Hist_title ; X_title ; Y_title" TH1F *h1 = new TH1F("h1", "Two gaussian plots and their ratio;x title; h1 and h2 gaussian histograms", 100, -5, 5); TH1F *h2 = new TH1F("h2", "h2", 100, -5, 5); h1->FillRandom("gaus"); h2->FillRandom("gaus"); // Define the Canvas TCanvas *c = new TCanvas("c", "canvas", 800, 800); // Upper plot will be in pad1 TPad *pad1 = new TPad("pad1", "pad1", 0, 0.3, 1, 1.0); pad1->SetBottomMargin(0); // Upper and lower plot are joined pad1->SetGridx(); // Vertical grid pad1->Draw(); // Draw the upper pad: pad1 pad1->cd(); // pad1 becomes the current pad h1->SetStats(0); // No statistics on upper plot h1->Draw(); // Draw h1 h2->Draw("same"); // Draw h2 on top of h1 // Do not draw the Y axis label on the upper plot and redraw a small // axis instead, in order to avoid the first label (0) to be clipped. h1->GetYaxis()->SetLabelSize(0.); TGaxis *axis = new TGaxis( -5, 20, -5, 220, 20,220,510,""); axis->SetLabelFont(43); // Absolute font size in pixel (precision 3) axis->SetLabelSize(15); axis->Draw(); // lower plot will be in pad c->cd(); // Go back to the main canvas before defining pad2 TPad *pad2 = new TPad("pad2", "pad2", 0, 0.05, 1, 0.3); pad2->SetTopMargin(0); pad2->SetBottomMargin(0.2); pad2->SetGridx(); // vertical grid pad2->Draw(); pad2->cd(); // pad2 becomes the current pad // Define the ratio plot TH1F *h3 = (TH1F*)h1->Clone("h3"); h3->SetLineColor(kBlack); h3->SetMinimum(0.8); // Define Y .. h3->SetMaximum(1.35); // .. range h3->Sumw2(); h3->SetStats(0); // No statistics on lower plot h3->Divide(h2); h3->SetMarkerStyle(21); h3->Draw("ep"); // Draw the ratio plot // h1 settings h1->SetLineColor(kBlue+1); h1->SetLineWidth(2); // Y axis h1 plot settings h1->GetYaxis()->SetTitleSize(20); h1->GetYaxis()->SetTitleFont(43); h1->GetYaxis()->SetTitleOffset(1.55); // h2 settings h2->SetLineColor(kRed); h2->SetLineWidth(2); // Ratio plot (h3) settings h3->SetTitle(""); // Remove the ratio title // Y axis ratio plot settings h3->GetYaxis()->SetTitle("ratio h1/h2 "); h3->GetYaxis()->SetNdivisions(505); h3->GetYaxis()->SetTitleSize(20); h3->GetYaxis()->SetTitleFont(43); h3->GetYaxis()->SetTitleOffset(1.55); h3->GetYaxis()->SetLabelFont(43); // Absolute font size in pixel (precision 3) h3->GetYaxis()->SetLabelSize(15); // X axis ratio plot settings h3->GetXaxis()->SetTitleSize(20); h3->GetXaxis()->SetTitleFont(43); h3->GetXaxis()->SetTitleOffset(4.); h3->GetXaxis()->SetLabelFont(43); // Absolute font size in pixel (precision 3) h3->GetXaxis()->SetLabelSize(15); }
The following program performs the arithmetic operation of adding two numbers and prints their sum on the screen. In this example, the user must input two numbers. Declare the Variables: The first step in adding two numbers using C programming is to declare the variables that will store the values of the two numbers. In C programming, we can declare variables using the syntax: data_type variable_name; For example, to declare two variables that will store the values of the two numbers, we can use the following code: int num1, num2; Get Input from User: After declaring the variables, we need to get the input from the user. To do this, we can use the scanf() function. The scanf() function reads the input from the user and stores it in the variables. Here is the code to get the input from the user: printf("Enter the first number: "); scanf("%d", &num1); printf("Enter the second number: "); scanf("%d", &num2); Add the Numbers: Now that we
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