// printf.c
#include <stdio.h>

int main(void)
{
    int a = 10;
    float b = 1.5;
    double c = 1.5;

    printf("Hello\nWorld\n");
    /*=> Hello
         World */
    printf("   123456\n");
    printf("a: %6d\n",a); // => a:     10
    printf("b: %6.4f\n",b); // => b: 1.5000
    printf("c: %06.2lf\n",c); // => c: 001.50

    return 0;
}