blob: 5c75d03f21c1ddef05766971b7beb58bcff5cd0c (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
#include <stdio.h>
#define MAXLEN 15
void reverse(char str[]);
char* itoa(int n, char str[]);
int
main(void)
{
int n = 2147483647;
char str[MAXLEN];
printf("%d\n", n);
printf("%s\n", itoa(n, str));
return 0;
}
void
reverse(char str[])
{
int i, j;
char temp;
for (j = 0; str[j] != '\0'; j++)
;
for (i = 0, --j; i < j; i++, j--) {
temp = str[i];
str[i] = str[j];
str[j] = temp;
}
}
char*
itoa(int n, char str[])
{
int sign, i;
/* to include the most -ve int */
n = ((sign = n) < 0) ? -(n+1) : n-1;
i = 0;
do {
str[i++] = n%10 + '0';
} while ((n /= 10) > 0);
if (sign <0)
str[i++] = '-';
/* part of "to include the most -ve int" */
str[0] += 1;
str[i] = '\0';
reverse(str);
return str;
}
|
