format-specifiers

I'm trying to print types like off_t and size_t . What is the correct placeholder for printf() that is portable ? Or is there a completely different way to print those variables? You can use z for size_t and t for ptrdiff_t like in printf("%zu %td", size, ptrdiff); But my manpage says some older library used a different character than z and discourages use of it. Nevertheless, it's standardized (by the C99 standard). For those intmax_t and int8_t of stdint.h and so on, there are macros you can use, like another answer said: printf("value: %" PRId32, some_int32_t); printf("value: %" PRIu16,

#include <stdio.h> int main() { unsigned long long int num = 285212672; //FYI: fits in 29 bits int normalInt = 5; printf("My number is %d bytes wide and its value is %ul. A normal number is %d.\n", sizeof(num), num, normalInt); return 0; } Output: My number is 8 bytes wide and its value is 285212672l. A normal number is 0. I assume this unexpected result is from printing the unsigned long long int . How do you printf() an unsigned long long int ? John Downey Use the ll (el-el) long-long modifier with the u (unsigned) conversion. (Works in windows, GNU). printf("%llu", 285212672); You may want