Re: Faster way to write in a file

#include <stdio.h>

void convert(long long v,char *s,int sz,int dp)
{ char *p = s + sz;
long long x = 1LL;
int sign = v < 0.0;

if (sign) v = -v;
while (dp--) x *= 10;
x = x * v;

*p-- = '\0';
do
{ *p-- = '0' + (x % 10);
} while ((p >= s) && (x /= 10));

while (p >= s) *p-- = '0';

if (sign) *s = '-';

}

int main(void)
{ long long test = -123456789012345;
char buffer[64];

convert(test,buffer,25,5);
printf("'%s'\n",buffer);
// then fwrite(buffer...)

return 0;

}
.