Challenge 1: Printing sizeof for Five Basic Types — Possible Solution
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#include <stdio.h>

int main() {
    printf("%zu\n", sizeof(int));
    printf("%zu\n", sizeof(char));
    printf("%zu\n", sizeof(float));
    printf("%zu\n", sizeof(double));
    printf("%zu\n", sizeof(long));
    return 0;
}

Typical output on a modern 64-bit system (not guaranteed elsewhere):

    4
    1
    4
    8
    8

WHY THIS WORKS AS AN ANSWER
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%zu is the correct format specifier for the type sizeof returns
(size_t, an unsigned type) -- using %d would technically be undefined
behavior on most 64-bit platforms since size_t and int are different
widths. The printed values are typical, not guaranteed, exactly per
the chapter's own point: only char's size (always 1) is fixed by the
standard.