Formatting and conversion

At a market stall, you count whole apples but might split them across baskets. printf needs the right placeholder for each argument: %d for an int, %.2f for a double shown to two decimal places, and %c for a character. Match them in order. A mismatch can cause undefined behavior, not just an ugly receipt.

Before running this, decide whether integer division could give 2.50. The cast turns apples into a double before division; converting the result afterward would be too late.

#include <stdio.h>

int main(void) {
    int apples = 5;
    int baskets = 2;
    double average = (double) apples / baskets;
    printf("Apples: %d; per basket: %.2f\n", apples, average);
    return 0;
}

Remove (double) for one run. The output becomes 2.00: integer division yielded 2 before that value was stored as a double. Restore the cast.

The aisle is a character in single quotes; the printed text is a string in double quotes. Each value below has its own placeholder:

#include <stdio.h>

int main(void) {
    char aisle = 'C';
    double weight = 1.25;
    printf("Aisle %c: %.2f kg\n", aisle, weight);
    return 0;
}

For the shop-total exercise, the result is an integer. Print it with %d.