C If...Else and Switch

if, else if and else choose between paths. switch picks a branch by value; use break to stop at the end of a case.

ExampleC

#include <stdio.h>

int main(void) {
  int score = 72;
  if (score >= 90) {
    printf("A\n");
  } else if (score >= 70) {
    printf("B\n");
  } else {
    printf("C\n");
  }

  int day = 3;
  switch (day) {
    case 1: printf("Monday\n"); break;
    case 3: printf("Wednesday\n"); break;
    default: printf("Other\n");
  }

  printf("%s\n", (score >= 50) ? "pass" : "fail");
  return 0;
}

Output

B
Wednesday
pass

Quick check

What happens if you forget break in a switch case?

NothingExecution continues into the next caseThe compiler refuses

Finish the quick check (and any code exercise) to complete this lesson, or mark it done yourself.

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