#include <stdio.h>
void tweedledee (int a, int b, int c)
{
}
void tweedledum (int a, int b)
{
}
/* To shorten example, not using argp */
int main()
{
tweedledee (1, 2);
tweedledum (1, 2, 3);
return 0;
}
The tweedledee function takes three parameters, but main
passes it two, whereas the tweedledum function takes two
parameters, but main passes it three. The result is a pair of
straightforward error messages:
params.c: In function `main':
params.c:14: too few arguments to function `tweedledee'
params.c:15: too many arguments to function `tweedledum'
This is one reason for the existence of function prototypes. Before
the ANSI Standard, compilers did not complain about this kind of
error. If you were working with a library of functions with which you
were not familiar, and you passed one the wrong number of parameters,
the error was sometimes difficult to track. Contemporary C compilers
such as GCC that follow the standard make finding parameter mismatch
errors simple.
