Last time I have given an example of how to use an __int64 number at gcc or vc6 here http://icfun.blogspot.com/2008/04/use-of-int64-variable-in-c.html. Today I'm going to explain how to find the number of digits from a given int64 number. This is easy. Just follow the below example.
#include<stdio.h>
#include<string.h>
int main(){
__int64 i = 1099897826746536290;
char digits[30];
sprintf(digits,"%I64d\n",i);
printf("Digits : %d\n",strlen(digits)-1);
return 0;
}
Comments
You don't have to call any STL functions to achieve this functionality, see the amtDigits function below. (PS, your blog doesn't accept the HTML PRE tag).
#include <stdio.h>
// The actual function which counts the
// digits in the long long (__int64)
unsigned int amtDigits(long long i64cnt)
{
unsigned int count;
for ( count = 0; i64cnt; count++ )
i64cnt /= 10;
return count;
}
int main ( void )
{
// EXAMPLE CODE:
__int64 bigInt1 = 12345678901234567; // 17 count
__int64 bigInt2 = 12345; // 5 count
__int64 bigInt3 = 1234567890123456789; // 19 count
printf("Digits: %d\n", amtDigits(bigInt1) );
printf("Digits: %d\n", amtDigits(bigInt2) );
printf("Digits: %d\n", amtDigits(bigInt3) );
return 0;
}