QT C++ code samples

#include <stdio.h>
using namespace std;
vector<vector <int>> array;
vector<int>::iterator itv;
vector<vector <int>>::iterator itvv;
array.push_back({100,3});
array.push_back({110,4});
array.push_back({120,5});
array.push_back({130,130});

//C language printout style :
printf("array: %i\n", array[0][0]); //100

//Qt C++ language printout style :
qDebug()<< "array :" << array.at(0); //std::vector(100, 3)
qDebug()<< "array :" << array.at(1); //std::vector(110, 4)
qDebug()<< "array :" << array.at(2); //std::vector(120, 5)

qDebug()<< "array :" << array[0][0]; //100
qDebug()<< "array :" << array[1][0]; //110
qDebug()<< "array :" << array[2][0]; //120

qDebug()<< "array :" << array[0][1]; //3
qDebug()<< "array :" << array[1][1]; //4
qDebug()<< "array :" << array[2][1]; //5

//work with counters :
for(unsigned int i = 0; i < array.size(); ++i){
    qDebug()<< "array at pos : " << i << " value : " << array[i][0]; //100, 110, 120..
}

for(unsigned int i = 0; i < array.size(); ++i){
    qDebug()<< "array at pos : " << i << " value : " << array[i][1]; //3, 4 ,5
}

//work with pointers :
for(itvv = array.begin(); itvv != array.end(); ++itvv){
    qDebug()<< "pointer *itv : " << *itvv;
    //output :
    //pointer *itv :  std::vector(100, 3)
    //pointer *itv :  std::vector(110, 4)
    //pointer *itv :  std::vector(120, 5)
}

for(itvv = array.begin(); itvv != array.end(); ++itvv){

    qDebug()<< "first row :" << (*itvv)[0];
    //output :
    //100
    //110
    //120
    qDebug()<< "second row :" << (*itvv)[1];
    //output :
    //3
    //4
    //5

    if((*itvv)[1] == (*itvv)[0]){ //if first row value = second row value.
        qDebug()<< "match found for value : " << *itvv;
        //output:
        //std::vector(130, 130)

    }
}

//don't forget to clean up memory space..
array.empty();
array.shrink_to_fit();