The % Format Specifiers %c char single character %d (%i) int signed integer %e (%E) float or double exponential format %f float or double signed decimal %g (%G) float or double use %f or %e as required %o int unsigned octal value %p pointer address stored in pointer %s array of char sequence of characters %u int unsigned decimal %x (%X) int unsigned hex value Internally what matters is the bits arrangement not the statements. unsigned int ui = 0xffffffff; printf("%d", ui); // -1 printf("%u", ui); // 4294967295 When you say to the 'printf' "%u" you're saying: "interpret my word as a unsigned bit arrangement", and in the other side, when you say "%d" you're saying "interpret my word as a signed bit arrangement". %u를 쓰면 ui 변수의 bit array를 unsigned int로 해석하고 출력 %d를 쓰면 ui 변수의 bit array를 signed int 처럼 해석하고 출력한다. int si = 0xffffffff; printf("%d",
