Convert Integer to String

Program convert an integer to string
/****
function that converts an integer into a string
representing of that integer....
[integer can start with an optional + or - sign]

intTOstring1() - uses while loop (need reverse() to
reverse the string

intTOstring2() - uses recursion ( don't need to reverse )

example
char s[100];
intTOstring(-134234, s);
printf(s);
output: -134234
****/

//This function uses recursion to convert integer to string
void intTOstring2(int x, char *s)
{

static int i = 0;
if (x < 0)
{

s[i++] = '-';
x = -x;

}
if ( x/10 )
{

intTOstring2( x/10, s );

}
s[i++] = x%10 + '0';
s[i] = '\0';

}

//This function uses a while loop to convert integer to string
//This function will then call reverse() function to reverse the string
void intTOstring1(int x, char *s)
{

int isNegative = 0,tmp;
char *p = s,*t = s,tmp1;
if( x == 0 )
{

*s = '0';
*(s+1) = '\0';
return;

}

if ( x < 0 )
{

isNegative=1;
x*=-1;

}

//keep dividing by 10 and collect each digit
while ( x > 0 )
{

tmp = x%10;
*p++ = tmp+'0';
x /= 10;

}
if( isNegative )
*p++ = '-';
*p = '\0';

}

//reverse the string
void reverse( char *s )
{

char *p = s,*t = s,tmp;

while ( *p )
p++;
while ( t < p )
{

tmp = *t;
*t++ = *--p;
*p = tmp;

}

}