foo.cc: In function 'int yf(int&, int&)':
foo.cc:21:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
foo.cc: In function 'int main()':
foo.cc:136:25: warning: use of 'll' length modifier with 'f' type character has either no effect or undefined behavior [-Wformat=]
     printf("%llf.",inter);
                         ^
foo.cc:137:15: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
     if(success=false){
        ~~~~~~~^~~~~~
foo.cc:141:38: warning: use of 'll' length modifier with 'f' type character has either no effect or undefined behavior [-Wformat=]
         case notx:printf("%llf",small);
                                      ^
foo.cc:142:40: warning: use of 'll' length modifier with 'f' type character has either no effect or undefined behavior [-Wformat=]
         case chun:printf("(%llf)",small);
                                        ^
foo.cc:143:50: warning: use of 'll' length modifier with 'f' type character has either no effect or undefined behavior [-Wformat=]
         case hun:printf("%llf(%llf)",small,small2);
                                                  ^
foo.cc:143:50: warning: use of 'll' length modifier with 'f' type character has either no effect or undefined behavior [-Wformat=]
foo.cc:85:9: warning: unused variable 'blen' [-Wunused-variable]
     int blen=longer(b);
         ^~~~
foo.cc:90:9: warning: variable 'dot' set but not used [-Wunused-but-set-variable]
     int dot;
         ^~~
foo.cc:79:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d",&a,&b);
     ~~~~~^~~~~~~~~~~~~~~
foo.cc:129:13: warning: 'start_jl' may be used uninitialized in this function [-Wmaybe-uninitialized]
             if(c/b==start_jl){
             ^~

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