Question

How to use variadic function to sum a set of numbers in C

Answer 1

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

// int function_name(data_type variable_name, ...);

int sum(int total, ...) {
	va_list ptr;

	va_start(ptr, total);

	int sum = 0;

	for (int i = 0; i < total; i++)
		sum += va_arg(ptr, int);

	va_end(ptr);

	return sum;
}

int main() {
	printf("%d\n", sum(5, 1, 2, 3, 4, 5));

	printf("%d\n", sum(3, 45, 89, 100));

	return 0;
}



/*
run:
 
15
234
 
*/

 

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