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# include <iostream>
using namespace std;
 
int main {
  int minMN = 0, maxMN = 0, threeRaiseMin = 1, twoRaiseMax = 1;
  int m, n, i, j;
  cout << "give m and n:" <<
  cin >>m>>n;  
  for(i = m, j = n; ((i >= 0)||(j >= 0)); i--, j--){
    if((i >= 1)&&(j >= 1)){
      minMN++;
      threeRaiseMin *= 3;
    }
    maxMN++;
    twoRaiseMax *=2;
  }
  return 0;
}

prog.cpp:4:5: error: cannot declare ‘::main’ to be a global variable
 int main {
     ^~~~
prog.cpp:5:3: error: expected primary-expression before ‘int’
   int minMN = 0, maxMN = 0, threeRaiseMin = 1, twoRaiseMax = 1;
   ^~~
prog.cpp:5:3: error: expected ‘}’ before ‘int’
prog.cpp:7:3: error: ‘cout’ does not name a type
   cout << "give m and n:" <<
   ^~~~
prog.cpp:9:3: error: expected unqualified-id before ‘for’
   for(i = m, j = n; ((i >= 0)||(j >= 0)); i--, j--){
   ^~~
prog.cpp:9:25: error: expected ‘)’ before ‘>=’ token
   for(i = m, j = n; ((i >= 0)||(j >= 0)); i--, j--){
                         ^~
prog.cpp:9:25: error: expected ‘)’ before ‘>=’ token
prog.cpp:9:43: error: ‘i’ does not name a type
   for(i = m, j = n; ((i >= 0)||(j >= 0)); i--, j--){
                                           ^
prog.cpp:17:3: error: expected unqualified-id before ‘return’
   return 0;
   ^~~~~~
prog.cpp:18:1: error: expected declaration before ‘}’ token
 }
 ^

Standard output is empty