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int f (int x){
    if (x== 0) return 1;
    else if (x==1) return 3;
{
        printf("%d    ", f(x-2/) + f(x-1 ));
        return f(x-1) + f(x-2);
    }
}
void main()
{
   f(4);
}

prog.c: In function ‘f’:
prog.c:5:9: warning: implicit declaration of function ‘printf’ [-Wimplicit-function-declaration]
         printf("%d    ", f(x-2/) + f(x-1 ));
         ^~~~~~
prog.c:5:9: warning: incompatible implicit declaration of built-in function ‘printf’
prog.c:5:9: note: include ‘<stdio.h>’ or provide a declaration of ‘printf’
prog.c:5:32: error: expected expression before ‘)’ token
         printf("%d    ", f(x-2/) + f(x-1 ));
                                ^
prog.c: At top level:
prog.c:9:6: warning: return type of ‘main’ is not ‘int’ [-Wmain]
 void main()
      ^~~~

Standard output is empty