如何在sprintf()中获得追加模式

#include <stdio.h>
#include <stdarg.h>

int main()
{
    char buf[100];
    int i = 1234;
    float f = 3.14159265359;
    const char *format = "%d %f";

    sprintf(buf, format, i, f);

    printf("buf: %s\n", buf);

    return 0;
}

#include <stdio.h>
#include <stdarg.h>

int main()
{
    char buf[100];
    int i = 1234;
    float f = 3.14159265359;
    const char *format = "%d %f";

    snprintf(buf, sizeof(buf), format, i, f);

    printf("buf: %s\n", buf);

    return 0;
}