#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>   /* va_start, va_arg, va_end */

int add(int a,int b)
{
return a+b;
}

int add(int a,int b,int c)
{
return a+b+c;
}

int add(int a,int b,int c,int d)
{
return a+b+c+d;
}

double add(int a,int b,int c,int d,double e)
{
return a+b+c+d+e;
}

double add(int a,int b,int c,int d,int k,...)
{
va_list doubs;
int i;
double work=a+b+c+d;

va_start(doubs,k);
for (i=0;i<k;i++)
  work+=va_arg(doubs,double);
va_end(doubs);

return work;
}

int main()
{
printf("add(1,2)=%d\n",add(1,2));
printf("add(1,2,3)=%d\n",add(1,2,3));
printf("add(1,2,3,4)=%d\n",add(1,2,3,4));
printf("add(1,2,3,'c')=%c\n",add(1,2,3,'c'));
printf("add(1,2,3,4,0.005)=%lf\n",add(1,2,3,4,0.005));
printf("add(1,2,3,4,4,0.1,0.02,0.003,0.0004)=%lf\n",
  add(1,2,3,4,4,0.1,0.02,0.003,0.0004));
}