f0707.cpp

it is a usefull thing

//=====================================
// f0707.cpp
//=====================================
#include<iostream>
#include<iomanip>
#include<fstream>
#include<vector>
using namespace std;
//-------------------------------------
typedef vector<vector<int> > Mat;
void input(istream& in, Mat& a);
Mat matAdd(const Mat& a, const Mat& b);
void print(const Mat& a);
//-------------------------------------
int main(){
  ifstream in("ab.txt");
  for(int row,col; in>>row>>col; ){
    Mat a(row,vector<int>(col));
    Mat b=a;
    input(in, a);
    input(in, b);
    print(matAdd(a,b));
  }
}//------------------------------------
void input(istream& in, Mat& a){
  for(int i=0; i<a.size(); ++i)
  for(int j=0; j<a[0].size(); ++j)
    in>>a[i][j];
}//------------------------------------
Mat matAdd(const Mat& a, const Mat& b){
  Mat c=a;
  for(int i=0; i<a.size(); ++i)
  for(int j=0; j<a[0].size(); ++j)
    c[i][j] += b[i][j];
  return c;
}//------------------------------------
void print(const Mat& a){
  for(int i=0; i<a.size(); ++i){
    for(int j=0; j<a[0].size(); ++j)
      cout<<setw(4)<<a[i][j];
    cout<<endl;
  }
}//====================================