امثلة على استخدام IF-ELSE في ++C

#include 

using namespace std;

int main()
{
  //write a program asks student to enter his mark, then checks if student passed of failed and print result
  int mark;
  cout<<"enter your mark:";
  cin>>mark;
  if(mark>=60)
  cout<<"pass";
  else cout<<"fail";
  
return 0;
}

#include 

using namespace std;

int main()
{
//same program but more specfic conditions:
  int mark;
  cout<<"enter your mark:";
  cin>>mark;
  if(mark>100 || mark<0)//2 conditions in one if
  cout<<"invalid entry";
  else if(mark>=60)
  cout<<"pass";
  else cout<<"fail";
return 0;
}

#include 

using namespace std;

int main()
{
  int mark;
  cout<<"enter your mark:";
  cin>>mark;
  if(mark>100 || mark<0)//2 conditions in one if
  cout<<"invalid entry";
  
  else if(mark>=90)
  cout<<"A";
  else if(mark>=80)
  cout<<"B";
  else if(mark>=70)
  cout<<"C";
  else if(mark>=60)
  cout<<"D";
  else cout<<"F";
  return 0;
}

#include 

using namespace std;

int main()
{
 c+int daynumber; 
 cout<<"enter the day number:";
 cin>>daynumber;
 if(daynumber==1)
 cout<<"saturday";
 else if(daynumber==2)
 cout<<"sunday";
 else if(daynumber==3)
 cout<<"monday";
 else if(daynumber==4)
 cout<<"tuesday";
 else if(daynumber==5)
 cout<<"wednsday";
 else if(daynumber==6)
 cout<<"tuesday";
 else if(daynumber==7)
 cout<<"thursday";
 if(daynumber>7 || daynumber<=0)
  cout<<"ERROR";
return 0;
}

int x = 20;
int y = 18;
if (x > y) {
  cout << "x is greater than y";
}

int time = 20;
if (time < 18) {
  cout << "Good day.";
} else {
  cout << "Good evening.";
}
// Outputs "Good evening."

int time = 20;
string result = (time < 18) ? "Good day." : "Good evening.";
cout << result;

int time = 22;
if (time < 10) {
  cout << "Good morning.";
} else if (time < 20) {
  cout << "Good day.";
} else {
  cout << "Good evening.";
}
// Outputs "Good evening."

int n;

    cout << "Enter an integer: ";
    cin >> n;

    if ( n % 2 == 0)
        cout << n << " is even.";
    else
        cout << n << " is odd.";