#include <stdio.h>
#include <string.h> // Added for strlen
int main() {
    double x = 1.0 / 3.0;
    printf("x = %.15g\n", x);
    printf("(long)x = %ld\n", (long)x);
    printf("x == (long)x: %s\n", x == (long)x ? "true" : "false");
    
    char buffer[128];
    if (x == (long)x) {
        snprintf(buffer, sizeof(buffer), "%ld", (long)x);
        printf("Using integer format: '%s'\n", buffer);
    } else {
        snprintf(buffer, sizeof(buffer), "%.15g", x);
        printf("Using float format: '%s'\n", buffer);
    }
    return 0;
}