62 lines
1.1 KiB
C
62 lines
1.1 KiB
C
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#include <stdio.h>
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#define MAXLINE 1000
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void reverse(char s[]);
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int mystrlen(char s[]);
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int get_line(char s[], int maxline);
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/* reverses input line by line */
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int main()
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{
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int end = 0;
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char line[MAXLINE + 1];
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while (end != EOF) {
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end = get_line(line, MAXLINE);
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reverse(line);
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printf("%s", line);
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if (end != EOF)
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putchar(end);
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}
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}
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/* reverses string 's' in place */
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void reverse(char s[])
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{
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char c;
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int i, len = mystrlen(s);
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for (i = 0; i < len / 2; ++i) {
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c = s[i];
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s[i] = s[len-i-1];
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s[len-i-1] = c;
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}
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}
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/* returns length of string 's' */
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int mystrlen(char s[])
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{
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int len;
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for (len = 0; s[len] != '\0'; ++len)
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;
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return len;
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}
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/* reads (possibly truncated) line from input to s, returns \n or EOF */
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int get_line(char s[], int maxline)
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{
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int c, i;
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for (i=0; (c=getchar()) != EOF && c != '\n'; ++i) {
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if (i < maxline)
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s[i] = c;
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}
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if (i < maxline)
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s[i] = '\0';
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else
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s[maxline] = '\0';
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return c;
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}
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