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In this section, we will see how to calculate the number of arguments when the number of arguments is variable in C.
C supports ellipses. This is used to pass a variable number of arguments to a function. The user can count parameters in one of three different ways.
Pass the first argument as the argument count
Pass the last argument as NULL.
Use logic like printf() or scanf() where the first argument has placeholders for the other arguments.
In the following program we will total The number of parameter variables passed.
#include<stdio.h> #include <stdarg.h> int get_avg(int count, ...) { va_list ap; int i; int sum = 0; va_start(ap, count); //va_start used to start before accessing arguments for(i = 0; i < count; i++) { sum += va_arg(ap, int); } va_end(ap); //va_end used after completing access of arguments return sum; } main() { printf("Total variable count is: %f", get_avg(5, 8, 5, 3, 4, 6)); }
Total variable count is: 5
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