if statement with variable logic operators : if statement « Operators statements « C++ Tutorial

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2. Operators statements
3. if statement

#include <iostream> 
using namespace std; 
  
int main() {  
  int a, b, c;  
  
  a = 2;  
  b = 3;  
  
  if(a < b) 
     cout << "a is less than b\n"; 
 
  if(a == b) 
     cout << "you won't see this\n";  
 
  cout << "\n"; 
 
  c = a - b;
 
  cout << "c contains -1\n"; 
  if(c >= 0) 
     cout << "c is non-negative\n"; 
  if(c < 0) 
     cout << "c is negative\n"; 
 
  cout << "\n"; 
 
  c = b - a; // c now contains 1 
  cout << "c contains 1\n"; 
  if(c >= 0) 
     cout << "c is non-negative\n"; 
  if(c < 0) 
     cout << "c is negative\n"; 
 
  return 0; 
}

a is less than b

c contains -1
c is negative

c contains 1
c is non-negative