将字符串转换为C中的unsigned long long int

Question

How can I convert a string to an unsigned long long int?

The problem is that if I use strtol that returns a long int, but I need to convert a string longer than that.

Answer 1

There is strtoull() which sounds like a very good match:

unsigned long long int strtoull(const char *nptr, char **endptr, int base);

No idea why you didn't find it.

Answer 2

You can use strtoll for long long type.

You can also use sscanf with %ll format specifier to convert to long long .

Also, you can write your own implementation if it does not fulfill your purpose.

Answer 3

如果只有一个标准的库函数可以扫描格式化的字符串... sscanf

Answer 4

strtoll应该做您想要的。