Graduation-Project/integral.cpp

#include <TFile.h>
#include <TTree.h>
#include <stdio.h>

void integral(TString file) {
    double e[24];
    int id[24], N[1];
    int sum1, sum2;

    TFile f(file);
    if (f.IsZombie()) {
        printf("cannot open root file\n");
        return;
    }
    TTree* t = (TTree*)f.Get("SimData1");
    if (!t) {
        printf("cannot find tree!\n");
        return;
    }
    t->SetBranchAddress("detE", e);
    t->SetBranchAddress("detId", id);
    t->SetBranchAddress("Ndets", N);
    int n = t->GetEntries();
    //	printf("n=%d\n", n);
    int i, j;
    sum1 = sum2 = 0;
    for (i = 0; i < n; i++) {
        t->GetEntry(i);
        for (j = 0; j < N[0]; j++) {
            if (e[j] > 0.18 && id[j] < 12) {
                sum1++;
            }
            if (e[j] > 0.18 && id[j] > 11) {
                sum2++;
            }
        }
    }
    printf("%d,%d,%d,%f\n", sum1 + sum2, sum1, sum2, 1.0 * sum1 / sum2);
}