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#include <stdio.h>
#include <string.h>
void main() {
char s[20];
printf("input string ? ");
scanf("%19s", s);
int len = strlen(s);
char *p = s, *q = s + (len - 1);
char c;
while (p < q) {
c = *p;
*p++ = *q;
*q-- = c;
}
printf("%s\n", s);
}