If you are familiar with method overloading. You know that more than one function can be defined by the same name. But C language does not support function overloading. Hence two functions can not be defined by the same name.
Now, if you want to pass one or more arguments to a function and the function should work with a different number of arguments. You have to use the technique of variable length of arguments.
In the following program, we are defining a function to calculate the average of numbers, where the function will receive one or more than one arguments.
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#include <stdio.h>
#include <stdarg.h>
float average(int count, ...);
int main() {
float res = average(3, 15, 20, 25);
printf("Average is :%f\n", res);
res = average(2, 15, 20);
printf("Average is :%f\n", res);
res = average(5, 15, 10, 20, 30, 50);
printf("Average is :%f\n", res);
return 0;
}
float average(int count, ...) {
va_list ap;
int j;
int sum = 0;
va_start(ap, count);
for (j = 0; j < count; j++) {
sum += va_arg(ap, int);
}
va_end(ap);
printf("Sum is : %d\n", sum);
return ((float)sum / count);
}
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