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#include <stdio.h>
#define MAXLINE 1000 /* maximum input line size */
int getln(char line[], int maxline);
void reverse(char to[], char from[], int len);
/* reverse the input line */
int main()
{
int len; /* current line length */
char line[MAXLINE]; /* current input line */
char rline[MAXLINE]; /* reversed line */
while ((len = getln(line, MAXLINE)) > 0) {
reverse(rline, line, len);
printf("%s", rline);
}
return 0;
}
/* getln: read a line into s, return length */
int getln(char s[], int lim)
{
int c, i;
for (i=0; i<lim-1 && (c=getchar())!=EOF && c!='\n'; ++i)
s[i] = c;
if (c == '\n') {
s[i] = c;
++i;
}
s[i] = '\0';
return i;
}
/* reverse: reverse the string */
void reverse(char to[], char from[], int len)
{
int i, nl = 0;
if (from[len-1] == '\n') {
nl = 1;
--len;
}
for (i=0; i < len; ++i)
to[i] = from[len-i-1];
if (nl == 1) {
to[i] = '\n';
++i;
}
to[i] = '\0';
}
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