va_list with multiple types

i want to write soemthing like this:
a function which will print various types of arguments.
I tried to work with va_list, it doesn't work.
int main(){
write("this ",1.2," is ",'a',7," test");
}
should result in:
this 1.2 is a7 test

learn2printf

#include <stdio.h>
int main(){ printf("%s%.1f%s%c%d%s\n", "this ", 1.2, " is ", 'a', 7, " test"); }