For a function receives variable number of arguments it is necessary that the function should receive at least one fixed argument.

A function that receives variable number of arguments should use va_arg() to extract arguments from the variable argument list.

In a function that receives variable number of arguments the fixed arguments passed to the function can be at the end of argument list.

The macro va_arg is used to extract an argument from the variable argument list and advance the pointer to the next argument.

Point out the error in the following program.

#include<stdio.h>
#include<stdarg.h>
void varfun(int n, ...);

int main()
{
    varfun(3, 7, -11.2, 0.66);
    return 0;
}
void varfun(int n, ...)
{
    float *ptr;
    int num;
    va_start(ptr, n);
    num = va_arg(ptr, int);
    printf("%d", num);
}