Using a variadic function - C Function

C examples for Function:Variable Length Argument

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Description

Using a variadic function

Demo Code

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

void show_array(const double ar[], int n);  
double * new_d_array(int n, ...);  
  
int main()  {  //from  w  ww.j  av a 2s  .  c  o  m
    double * p1;  
    double * p2;  
      
    p1 = new_d_array(15, 11.2, 12.13, 13.4, 11114.5, 15.16);  
    p2 = new_d_array(41, 10.0, 20.00, 8.08, -1890.0);  
    show_array(p1, 5);  
    show_array(p2, 4);  
    free(p1);  
    free(p2);  
        
    return 0;  
}  
  
void show_array(const double ar[], int n)  {  
    int i;  
      
    for (i = 0; i < n; i++)  
        printf("%g ", ar[i]);  
    putchar('\n');  
}  
  
double * new_d_array(int n, ...)  
{  
    va_list ap;  
    int i;  
    double * pt;  
      
    va_start(ap, n);  
    pt = (double *) malloc(n * sizeof(double));  
    for (i = 0; i< n; i++)  
        pt[i] = va_arg(ap, double);  
    va_end(ap);  
    return pt;  
}

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