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C function "strtoull" failing

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# 1  
C function "strtoull" failing

I have a code in which I am passing string "5368709120" to function strtoull() and it should had returned me number 5368709120 but instead it returns me 1073741824 which is incorrect.

What may be the possible cause of this and how to rectify it?

    typedef unsigned long long    ULL_Type;
    char *numStr = "5368709120";
    ULL_Type            num;

    num = strtoull(numStr, NULL, 10);

Last edited by rupeshkp728; 09-30-2013 at 02:24 PM..
# 2  
MY this looks familiar: C function "strtoull" failing

You are doing yourself and the people who help you a disservice by plastering your question all over the net.

Your problem is: read about how to print an unsigned long long - the printf format string.
This User Gave Thanks to jim mcnamara For This Post:
# 3  
I am not printing the value instead storing it in some variable.
now the value returnd by strtoull is wrong.
# 4  
Originally Posted by rupeshkp728
I am not printing the value instead storing it in some variable.
now the value returnd by strtoull is wrong.
Show us the code you used to determine that the value stored in num is 1073741824 rather than 5368709120! Decimal 5368709120 is hexadecimal 0x140000000 and decimal 1073741824 is 0x40000000. So, Jim's guess that you printed the value of num using something like:
printf("%lu\n", num);

sure seems to fit the symptoms of what you have described.
Please change:
    num = strtoull(numStr, NULL, 10);

in your code to:
    num = strtoull(numStr, NULL, 10);
    printf("%llu\n", num);

and let us know what it prints.

Last edited by Don Cragun; 09-30-2013 at 05:07 PM.. Reason: Fix typo.
This User Gave Thanks to Don Cragun For This Post:
# 5  
I printed it in gdb
(gdb) p strtoull(numStr, 0, 10) $17 = 1073741824

I tried p/u and it still prints the same thing.

Last edited by Scott; 09-30-2013 at 05:27 PM.. Reason: Code tags
# 6  
Originally Posted by rupeshkp728
I printed it in gdb
(gdb) p strtoull(numStr, 0, 10) $17 = 1073741824

I tried p/u and it still prints the same thing.
Check the return value from is better not to assume anything and make sure to include <stdlib.h> header file wherein strtoull is declared and post the entire code if it aint too big...
This User Gave Thanks to shamrock For This Post:
# 7  
Thanks all for the reply.

---------- Post updated at 08:28 PM ---------- Previous update was at 08:21 PM ----------

I am using llu only
printf("Integer of %s is %llu \n", numStr , num);

Output is
Integer of 5368709120 is 1073741824

---------- Post updated at 08:31 PM ---------- Previous update was at 08:28 PM ----------

Breakpoint hit at strtoull():
435                     num = strtoull(numStr, NULL, 10);

(gdb) p num
$1 = 140737488347680

(gdb) x/s numStr
0x7fffffffe5a3: "5368709120"

(gdb) p strtoull(numStr, NULL, 10)
$2 = 1073741824

(gdb) p/u strtoull(numStr, NULL, 10)
$3 = 1073741824

Executing the statement:
(gdb) n

(gdb) p num
$4 = 1073741824

(gdb) p/u num
$5 = 1073741824

Note that when I decrease one character from string i.e. if I pass "536870912" then it shows proper output.
Intger of 536870912 is 536870912

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