Reverse a string in-place.

Question

Potential · Accepted Answer

@Rahul,

Wouldn't the for condition be i < strlen(str)/2?

that way if you had a string of length 5, it would run for i=0 and i=1, but it wouldn't bother doing i=2 since that is the middle element and doesn't need switching.  Without the /2, you will reverse it, then re-reverse it again.

For an even length (like 6) you'd want it to do swaps on i=0, i=1, and i=2, but not i=3

Rahul · Answer

for(i = 0; i < strlen(str); i++)
{ 
      temp = str[i];
      str[i] = str[strlen(str) - 1 - i];
      str[strlen(str) - 1 - i] = temp;
}

BOOLKA · Answer

public static String reverseString(String s){
		int len = s.length();
		int temp  = len;
		StringBuffer sb = new StringBuffer();
		try {
				for(int i=1;i

Gaurav · Answer

void reverse(char* str)
{
    int len = strlen(str);
    char* end = str + len - 1;
    for(char* start = str; start > end; ++start, --end )
    {
        char ch = *start;
        *start = *end;
        *end = ch;
    }
}

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