Thread: Variable Argument List

Is there an alternative method to determine no. of arguments passed to function that accepts a variable argument list ?

i read va_end is a macro that set the pointer declared by va_list to NULL after no more item is left to be traveresed. I tried this, but i get a runtime crash

Code:

// Variable No. of Arguments Passed To Function

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

int findmax(int n,...);

main(void)
{
     int max;     
     max = findmax(3,50,66,12);
        printf("Max:%d",max);
     max = findmax(5,10,12,5,23,100);
        printf("\n\nMax:%d",max);
     getchar();
}

int findmax(int num,...)
{
    int max,n,k=1;
    
    va_list ptr;                     // declaring pointer of type va_list
    va_start(ptr,num);         // initializing pointer to beginning of variable argument list
    
    max = va_arg(ptr,int);           // retrieve value, and increment the pointer
    
    while(ptr!=NULL)
    {
         n = va_arg(ptr,int);
         if(n>max)
                    max = n; 
         k++;       
    }
    return(max);     
}

i have just change while(k<=num) in my code to find for an alternative solution