使用％u或％lu说明符

#include <stdio.h>
#include <string.h>      /* provides strlen() prototype */

#define PRAISE "this is a test test test test."

int main(void)
{
    char name[40];

    printf("What's your name? ");
    scanf("%s", name);
    printf("Hello, %s. %s/n", name, PRAISE);
    printf("Your name of %zd letters occupies %zd memory cells./n", strlen(name), sizeof name);
    printf("It has %zd letters ", strlen(PRAISE));
    printf("and occupies %zd memory cells./n", sizeof PRAISE);

    return 0;
}