Sscanf "double" failed

[MQ_Question]

Hi
Currently I want to get Double value from a Char array, but somehow when printing the Double variable, the value returns NULL.

double Val_double;
char testdou[] = "7777.00000";
sscanf(testdou,"%lf",&Val_double);
printf("+++++++++++ %lf ++++++++++\r\n",Val_double);

Please help me fix this problem!
I used nfr52832 and code Segger embedded studio 4.52.

Thank !!!!

[Henry_Chou]

char *pEnd;

Val_double=strtod(testdou,&pEnd);

[MQ_Question]

I have tried it but with no success. 

printf :    +++++++++++          ++++++++++

[Henry_Chou]

Display problems?....

I am not sure. Because my code result is like this.

The value is correct!

in gcc SES C

remeber to add on compiler flag

LDFLAGS += -u _scanf_float

if you use sscanf(); function

[MQ_Question]

[Henry_Chou]

So how about the watch window value in testdou?

[MQ_Question]

how to add "LDFLAGS + = -u _scanf_float" to SEG C