prntval.c

C Primer Plus(第五版)中文版,不用多说了

/* prntval.c -- finding printf()'s return value */
#include <stdio.h>
int main(void)
{
    int bph2o = 212;
    int rv;

    rv = printf("%d F is water's boiling point.\n", bph2o);
    printf("The printf() function printed %d characters.\n",
             rv);
    return 0;
}