f0706.cpp

it is a usefull thing

//=====================================
// f0707.cpp
//=====================================
#include<iostream>
#include<iomanip>
#include<fstream>
using namespace std;
//-------------------------------------
const int row=100;
const int col=100;
int main(){
  ifstream in("ab.txt");
  int ma[row][col];
  int mb[row][col];
  int mc[row][col];

  for(int r,c; in>>r>>c; ){
    for(int i=0; i<r; ++i)
    for(int j=0; j<c; ++j)
      in>>ma[i][j];
    for(int i=0; i<r; ++i)
    for(int j=0; j<c; ++j)
      in>>mb[i][j];

    for(int i=0; i<r; ++i)
    for(int j=0; j<c; ++j)
      mc[i][j] = ma[i][j] + mb[i][j];

    for(int i=0; i<r; ++i){
      for(int j=0; j<c; ++j)
        cout<<setw(4)<<mc[i][j];
      cout<<endl;
    }
  }
}//====================================