GCC behaviour when calling a function with too many arguments
c, gcc
Solution
In C, writing `void foo()` means that foo takes an unspecified number of arguments.
To indicate that the function `foo()` should take no arguments, you should write `void foo(void)`
For this reason you should also use the signature `int main(void)`.
Note that K&R function declarations are being removed in the C23 standard, however ( https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2841.htm ).
Problem
I just noticed a behaviour with GCC that seems strange to me (not checked with other compilers). If I compile this code : ``` #include <stdio.h> void foo(int i) { printf("Hello %d\n",i); } int main(){ foo(1, 2); return 0; } ``` I will get a compiler error : ``` test.c:9:5: error: too many arguments to function ‘foo’ ``` But if I compile this code : ``` #include <stdio.h> void foo() { printf("Hello\n"); } int main(){ foo(1, 2); return 0; } ``` I get no errors or warnings. Could someone explain me why ? I tested this with gcc 4.6.3 and arm-none-eabi-gcc 4.8.3 EDIT : I compile with all warnings : `gcc -Wall test.c`