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int *temp= new int[newRows*newColumns];
for(int i=0;i<newRows*newColumns;i++)
temp[i]=mass[i];
 
delete mass;
mass = temp;

prog.cpp:2:20: error: ‘newRows’ was not declared in this scope
 int *temp= new int[newRows*newColumns];
                    ^~~~~~~
prog.cpp:2:28: error: ‘newColumns’ was not declared in this scope
 int *temp= new int[newRows*newColumns];
                            ^~~~~~~~~~
prog.cpp:3:1: error: expected unqualified-id before ‘for’
 for(int i=0;i<newRows*newColumns;i++)
 ^~~
prog.cpp:3:13: error: ‘i’ does not name a type
 for(int i=0;i<newRows*newColumns;i++)
             ^
prog.cpp:3:34: error: ‘i’ does not name a type
 for(int i=0;i<newRows*newColumns;i++)
                                  ^
prog.cpp:6:1: error: expected unqualified-id before ‘delete’
 delete mass;
 ^~~~~~
prog.cpp:7:1: error: ‘mass’ does not name a type; did you mean ‘class’?
 mass = temp;
 ^~~~
 class

Standard output is empty