Step 4 of 6
switch
When one value is compared against a list of constant possibilities, switch is often clearer than a long else if chain:
#include <stdio.h>
int main(void) {
int day;
scanf("%d", &day);
switch (day) {
case 6:
case 7:
printf("weekend\n");
break;
case 5:
printf("almost weekend\n");
break;
default:
printf("weekday\n");
}
return 0;
}
7
weekend
How it works
switch evaluates the value in parentheses once, then jumps to the case label with the matching constant. From there, it runs statements downward until it hits a break (which leaves the switch) or the end. If no case matches, it jumps to default, or does nothing if there's no default.
Fall-through
Because execution continues until a break, forgetting one makes the program fall through into the next case and run its code too. That's a very common bug. It's also occasionally useful on purpose, as with case 6: and case 7: above sharing the same code.
Limits
case labels must be constant integer values, which includes characters like 'q'. You can't use ranges, strings or variables as labels; use if/else if for those.
Your task
Read a char and print the direction for w, a, s, d (forward, left, back, right), or unknown for anything else.
Challenge 2
Read a weapon slot number and print what's in it: 1 is rifle, 2 is pistol, 3 is knife, 4 is grenade, and anything else is empty.
Challenge 3
Read a single letter and print the map it stands for. Both lowercase and uppercase must work: d or D is Dust II, m or M is Mirage, i or I is Inferno. Anything else prints unknown map. Use a switch and let two cases share the same code.