倒序字中的最后一个字 function

Question

i have this reverse word function. it simply adding word to new string in reverse order. the problem with this code is it not print the last word ( first word before reverse ). i dont know why. please help fix my code

    char str[100], revstr[100];
    int i, j, index, len, startIndex, endIndex;
    printf("\n Please Enter any String :  ");
    gets(str);

    len = strlen(str);
    index = 0;
    endIndex = len - 1;

    printf("\n *****  Given String in Reverse Order  ***** \n");        
    for(i = len - 1; i > 0; i--)
    {
        if(str[i] == ' ')
        {
            startIndex = i + 1;

            for(j = startIndex; j <= endIndex; j++)
            {
                revstr[index] = str[j];
                index++;
            }
            revstr[index++] = ' ';
            endIndex = i - 1;               
        } 
    }

    printf("\n Given String in Reverse Order = %s", revstr); 
    return 0;

Answer 1

Here's a working code:

    char str[100], revstr[100];
    int i, j, index, len, startIndex, endIndex;
    printf("\n Please Enter any String :  ");
    gets(str);
    len = strlen(str);
    index = 0;
    endIndex = len - 1;

    printf("\n *****  Given String in Reverse Order  ***** \n");        
    for(i = len - 1; i >= -1; i--)
    {
        if(i == -1){
            startIndex = i + 1;

            for(j = startIndex; j <= endIndex; j++)
            {
                revstr[index] = str[j];
                index++;
            }
            revstr[index++] = ' ';
            endIndex = i - 1;  
            break;
        }
        if(str[i] == ' ')
        {
            startIndex = i + 1;

            for(j = startIndex; j <= endIndex; j++)
            {
                revstr[index] = str[j];
                index++;
            }
            revstr[index++] = ' ';
            endIndex = i - 1;               
        } 
    }

    printf("\n Given String in Reverse Order = %s", revstr); 

The problem was that you were only including a word if there was a space before it. There will be no space before the first word therefore I made the code go before the first letter and always include the first word forcefully. This code can be broken if there are more spaces than needed in the text.