How can I compare strings in C using a `switch` statement?

In C there is a switch construct which enables one to execute different conditional branches of code based on an test integer value, e.g.,

int a;
/* Read the value of "a" from some source, e.g. user input */
switch (a) {
  case 100:
    // Code
    break;
  case 200:
    // Code
    break;
  default:
    // Code
    break;
}

How is it possible to obtain the same behavior (i.e. avoid the so-called "if-else ladder") for a string value, i.e., a char *?