Main.cc: In function 'int main()':
Main.cc:14:17: error: 'b' was not declared in this scope
b[i][j+m]=a[i][j];
^
Main.cc:17:17: error: 'b' was not declared in this scope
b[i][j+m]=a[i][j];
^
Main.cc:22:19: error: 'b' was not declared in this scope
cout<b[i][j]<<" ";
^