#include <stdio.h>
void swap(int *a, int *b)
{
int tmp = *a;
*a = *b;
*b = tmp;
}
int length(char s[])
{
int i = 0;
while (s[i] != NULL)
++i;
return i - 1;
}
int main()
{
char s[100];
int n=length(s);
for(int i=0;i<=n/2;i++)
{
swap(&s[i],&s[n-i-1]);
}
for(int i=0;i<n;i++)
{
}
return 0;
}
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