variable_args_list.c

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

void foo(char *fmt, ...)
{
    va_list ap, ap2;
    int d;
    char c, *s;

    va_start(ap, fmt);
    va_copy(ap2, ap);
    while (*fmt)
        switch (*fmt++)
            {
            case 's':                       /* string */
                s = va_arg(ap, char *);
                printf("string %s\n", s);
                break;
            case 'd':                       /* int */
                d = va_arg(ap, int);
                printf("int %d\n", d);
                break;
            case 'c':                       /* char */
                /* Note: char is promoted to int. */
                c = va_arg(ap, int);
                printf("char %c\n", c);
                break;
            }
    va_end(ap);
    // ...
    //  use ap2 to iterate over the arguments again
    // ...
    va_end(ap2);
}



int main(int argc, char const *argv[])
{
    /* code */
    return 0;
}