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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAXLEN 1000
/* converts n to s with width w */
void itoa(int n, char s[], int w);
int main(int argc, char *argv[]) {
int i, c, n, w;
char s[MAXLEN];
printf("Number to convert to string: ");
for (i = 0; i < MAXLEN - 1 && (c = getchar()) != '\n' && c != EOF; i++)
s[i] = c;
s[i] = 0;
n = atoi(s);
printf("Width: ");
for (i = 0; i < MAXLEN - 1 && (c = getchar()) != '\n' && c != EOF; i++)
s[i] = c;
s[i] = 0;
w = atoi(s);
itoa(n, s, w);
printf("%d as string of width %d: %s\n", n, w, s);
return 0;
}
void reverse(char s[]) {
int c, i, j;
for (i = 0, j = strlen(s) - 1; i < j; i++, j--) {
c = s[i];
s[i] = s[j];
s[j] = c;
}
}
void itoa(int n, char s[], int w) {
int i;
i = 0;
if (n >= 0) {
do {
s[i++] = n % 10 + '0';
} while ((n /= 10) > 0);
} else {
do {
s[i++] = -(n % 10) + '0';
} while ((n /= 10) <= -1);
}
if (n < 0)
s[i++] = '-';
while (i < MAXLEN - 1 && i < w)
s[i++] = ' ';
s[i] = 0;
reverse(s);
}
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