#ifdef 64-bit
    #define DECIMAL_FORMAT %ld
#else
    #define DECIMAL_FORMAT %d
#endif
.
intptr_t d;
.
printf(“Some message with DECIMAL_FORMAT in the middle of itn”, d);

intptr_t d = ... ;
 printf("This is an intptr_t: %" PRIxPTR "n", d);

printf("Some message with %ld in the middle of itn", (long) d);

pid_t pid = fork();
printf("Fork returned %d.n", (int) pid);