function_with_variable_list_of_arguments.c

/*

    function_with_variable_list_of_arguments.c


    https://www.tutorialspoint.com/cprogramming/c_variable_arguments.htm


    You can find all my C programs at Dragan Milicev's pastebin:

    https://pastebin.com/u/dmilicev

*/

#include <stdio.h>
#include <stdarg.h> // for variable list of arguments, va_start() and va_end()

double average(char text[],int num,...) {

    va_list valist;
    double sum = 0.0;
    int i;

    va_start(valist, num);      // initialize valist for num number of arguments

    for (i = 0; i < num; i++)   // access all the arguments assigned to valist
      sum += va_arg(valist, int);

    va_end(valist);             // clean memory reserved for valist

    printf("\n %s \n", text);

    return sum/num;
}

int meny( char meny_title[],
          int number_of_meny_items, ... )
{
    int i;
    va_list valist;

    printf("\n%s\n", meny_title);

    va_start(valist, number_of_meny_items);     // initialize valist for num number of arguments

    for (i = 0; i < number_of_meny_items; i++)  // access all the arguments assigned to valist
        printf("%s\n", va_arg(valist, char*) );

    va_end(valist);                             // clean memory reserved for valist

    return 0;
}


int main(void)
{
    printf("Average of 2, 3, 4, 5 = %f \n", average("This is text",4, 2,3,4,5) );
    printf("Average of 5, 10, 15 = %f \n",  average("This is text",3, 5,10,15) );

    meny(   "MENY TITLE",
            5,
            "1. first item",
            "2. second item",
            "3. third item",
            "4. fourth item",
            "5. fifth item" );


    return 0;

} // main()