If not conditional on an enumerated value, switch statements should always have a default case (in the case of an enumerated value, the compiler will warn you if any values are not handled). If the default case should never execute, simply assert:

team_c++_style_guide_loops_and_switch_statements.h

switch (var) {
    case 0:      // 4 space indent
        ...      // 8 space indent
        break;
    case 1:
        ...
        break;
    default:
        assert(false);  // If the default case should never execute, simply assert
}

// Braces are required for single-statement loops.
for (int i = 0; i < kSomeNumber; ++i) {
    printf("I take it back\n");
}

while (condition) {
    // Repeat test until it returns false.
}

// Empty loop bodies should use {} or continue, but not a single semicolon.
for (int i = 0; i < kSomeNumber; ++i) {}  // Good - empty body.
while (condition) continue;  // Good - continue indicates no logic.