The else is ignored in this IF statement.Its a part of a project that isn't finished

[Abdu2101]

int j=5,r1=1;
      if(r1>=10 || r1<20){
            switch(r1){
                case 10:
                printf(" ten");
                break;
            case 11:
               printf(" eleven");
               break;
            case 12:
               printf(" twelve");
               break;
            case 13:
               printf(" thirteen");
               break;
            case 14:
               printf(" fourteen");
               break;
            case 15:
               printf(" fifteen ");
               break;
            case 16:
               printf(" sixteen ");
               break;
            case 17:
               printf(" seventeen ");
               break;
            case 18:
               printf(" eighteen ");
               break;
            case 19:
               printf(" nineteen ");
               break;
            default:
                break;
                    }
                  }
        else{
            switch (j){
            case 2:
               printf(" twenty");
               break;
            case 3:
               printf(" thirty");
               break;
            case 4:
               printf(" forty");
               break;
            case 5:
               printf(" fifty ");
               break;
            case 6:
               printf(" sixty ");
               break;
            case 7:
               printf(" seventy ");
               break;
            case 8:
               printf(" eighteen ");
               break;
            case 9:
               printf(" ninety ");
               break;
            default:
                break;
            }
        }

[laserlight]

Think carefully about this expression: (r1>=10 || r1<20). For what value of r1 does this expression evaluate to false?

Let's say we choose r1 < 10, say r1 == 0. Then r1 < 20 must be true, because if r1 < 10, then surely r1 < 20, because any integer that's less than 10 must be less than 20. Therefore the expression evaluates to true.

Let's say we choose r1 >= 20, say r1 == 30. Then r1 >= 10, because surely any integer that's greater than or equal to 20 is also greater than or equal to 10. Therefore the expression evaluates to true.

So, the expression is always true, hence the else branch is ignored.

[Abdu2101]

Thank you soo much