Useful tips for using printf in C

main.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char* argv[]) {
    int a = 199;
    printf("%d\n", a);
    printf("%x\n", a);
    printf("%X\n", a);
    printf("%#X\n", a);
    printf("%8d\n", a);
    printf("%08d\n", a);
    
    float b = 15.3;
    printf("%f\n", b);
    printf("%.2f\n", b);
    
    unsigned int c = 20;
    printf("%u\n" c);
    
    long long d = 100;
    printf("%lld\n", d);
    
    unsigned long long e = 100;
    printf("%llu\n", e);
    printf("%llu\n", sizeof(e));
    
    char f = 'a';
    printf("%c\n", f);
    
    int* p = &a;
    printf("%p\n", p);
    
    return 0;
}