Multiple values in if statement

Firstly, "=" is an assignment operator, not a comparison. Equality is tesed for with "==" instead.

Secondly, you need the AND or OR operator: && or ||
a AND b is true only if both conditions a and b are true - otherwise it returns false
a OR b is true only if either condition a and b are true - it returns false only if both are false.
For example:

if (a == 1 && b == 2 && c == 3)
   {
   ... 
   }

If this isn't what you meant, then you need to explain in a lot more detail exactly what you need!

Spend some time reading Elements of C | Microsoft Learn[^] as you seem to be missing the basics of the language.

There are several options. If you cannot combine numbers to a range, the switch-case statement is recommended.

switch(a) {
  case 1:
  case 3:
  case 5:
    printf("American feminine citizen");
    break;
  }
  switch(b) {
   case 2:
   case 4:
   case 6:
    printf("Foreign citizen masculine");
    break;
  }