Variadic function

myprintf.c

#include <stdio.h>
#include <stdarg.h>
void myprintf(const char *format, ...)
{
    va_list ap;
    char c;
    va_start(ap, format);
    while ( (c = *format) ) {
        format++;

        switch(c) {
            case 'c': {/* char is promoted to int when passed through '...' */
                char ch = va_arg(ap, int);
                putchar(ch);
                break;
            }
            case 's': {
                char *p = va_arg(ap, char *);
                fputs(p, stdout);
                break;
            }
            default:
                putchar(c);
        }
    }
    va_end(ap);
}
int main(void)
{
    myprintf("c\ts\n", '1', "hello");
    return 0;
}