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 #include <stdio.h> 
    struct S { 
        int S; 
    }; 
    int f(struct S *s) { 
        return --s.S; 
    } 
    int main(void) { 
        int i; 
        struct S S = { 2 }; 
        i = f(S); 
        printf("%d",i); 
        return 0; 
    } 

prog.c: In function ‘f’:
prog.c:6:19: error: ‘s’ is a pointer; did you mean to use ‘->’?
         return --s.S;
                   ^
                   ->
prog.c: In function ‘main’:
prog.c:11:15: error: incompatible type for argument 1 of ‘f’
         i = f(S);
               ^
prog.c:5:9: note: expected ‘struct S *’ but argument is of type ‘struct S’
     int f(struct S *s) {
         ^
prog.c: In function ‘f’:
prog.c:7:5: warning: control reaches end of non-void function [-Wreturn-type]
     }
     ^

Standard output is empty