C Reverse words in string

Trying to learn C and so I want to reverse each word in string. "Hello World" to "olleH dlroW" This is what I have so far.

int main()
    char str[100];
    int i;
    printf("Enter string:");

    for (i = 0; i <= strlen(str); i++)
        if (str[i] == ' ')
            // Here the space and how should I switch words now?

    return 0;

Should I do something like this:

temp = str[i]; j = str[i-1];

and then switch places? str[i]=j; and j=temp; I am stuck at this point here!


I won't give away the answer because this seems like a homework problem and is a great opportunity to learn, but here is a hint:

Think about how you could programatically reference the 'opposite' of each letter in the word. So str[0] and str[strlen(str)], and so on. That should help you, but feel free to probe with further questions.

Try this...

private void Button1_Click(object sender, EventArgs e)
    const string targetWords = "Hello World";
    int count = targetWords.Length;
    string result = null;
    string chr = null;

    while (!(count == 0)) {
        chr = targetWords.Substring((count - 1), 1);
        result += chr;
        count -= 1;


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