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// declaration
void func(void);
 
int main()
{
    int ar[] = { 1, 2, 3 };
    func(34); // call with parameter
    return 1;
}
 
void func(void) // no parameters
{
   printf("func()");
}

prog.c: In function ‘main’:
prog.c:7:5: error: too many arguments to function ‘func’
     func(34); // call with parameter
     ^
prog.c:2:6: note: declared here
 void func(void);
      ^
prog.c:6:9: warning: unused variable ‘ar’ [-Wunused-variable]
     int ar[] = { 1, 2, 3 };
         ^
prog.c: In function ‘func’:
prog.c:13:4: warning: implicit declaration of function ‘printf’ [-Wimplicit-function-declaration]
    printf("func()");
    ^
prog.c:13:4: warning: incompatible implicit declaration of built-in function ‘printf’ [enabled by default]

Standard output is empty