Summary - Conditionals

Combine if, switch and ternary to write a day-of-week app.

Summary - Conditionals

In this section you learned if, else if, else, switch, case, break, default and the ternary. Now we'll combine them in a day-of-week app.

The app takes a number (1-7) and prints the weekday. We'll do it first with if/else, then with switch; you'll see how both methods work.

Exercise Write the day with if/else

Write a C program. Declare int day = 3;. With if (day == 1) print printf("Monday\n");, with else if (day == 2) print printf("Tuesday\n");, with else if (day == 3) print printf("Wednesday\n");, with else print printf("Other\n");. Put #include <stdio.h> at the top.

Show example solution

#include <stdio.h>

int main(void) {
    int day = 3;
    if (day == 1) {
        printf("Monday\n");
    } else if (day == 2) {
        printf("Tuesday\n");
    } else if (day == 3) {
        printf("Wednesday\n");
    } else {
        printf("Other\n");
    }
    return 0;
}

Exercise Write the day with switch

Write a C program. Declare int day = 3;. With switch (day) print case 1: printf("Monday\n"); break;, case 2: printf("Tuesday\n"); break;, case 3: printf("Wednesday\n"); break;, default: printf("Other\n");. Put #include <stdio.h> at the top.

Show example solution

#include <stdio.h>

int main(void) {
    int day = 3;
    switch (day) {
        case 1:
            printf("Monday\n");
            break;
        case 2:
            printf("Tuesday\n");
            break;
        case 3:
            printf("Wednesday\n");
            break;
        default:
            printf("Other\n");
    }
    return 0;
}

Test yourself

Which value type does switch work with?
```
switch (x) { case 1: ...; }
```
- Only strings
- Integer or char
- Floating-point
- Arrays
Show answer

Integer or char — switch works only with integers or chars.

Even/odd with ternary

printf("%s
", (n % 2 == 0) ? "Even" : ____);

Show answer

printf("%s
", (n % 2 == 0) ? "Even" : "Odd");

Match the condition statements

if

Single condition
else if

Chained condition
switch

Multi-way
? :

One line

Next lesson: The for loop

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