Thread: need help in some code

First Program:

Your program is returning an incorrect number of words, so there is something wrong with your logic. This program can be accomplished much more easily with a variable that is used to indicate whether you are in a word or not (let's call it "inWord"). Make "inWord" equal to one if you are in a word (i.e. the current character is not a space) and make "inWord" equal to zero if you are not in a word (i.e. the current character is a space). See if developing the logic based around this idea helps you with the program.

Also, I don't understand why you're using the last "if/else" statement to print the output. The code in each branch is pretty much the same, so there's no use in an "if/else." Just print the output.

Some other notes:
- You should explicitly "return 0;" at the end of "main()"
- You shouldn't use "system("pause")" to keep the console open - "getchar()" would be better
- "gets()" is unsafe (see here) - consider "fgets()" as a safer alternative

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Second Program:

Your loop seems to be virtually useless here. Note that you are not using the value of "i" in the loop, so nothing is going to be different for any iteration. What if you tried this instead?

Code:

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<conio.h>

int main()
{
    char str[40];
    int c,mid;
    int i;
    gets(str);
    c=strlen(str);
//    for(i=0;i<c;i++)
//    {
//        if(c%2==0)
            mid=str[c/2];
//        else
//            mid=str[(c-1)/2];
//    }
    printf("%c",mid);
    printf("\n\n");
    system("pause");
}

Also, the same suggestions go for this program as the last one (see "Some other notes" above).

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For the third program, this doesn't seem too hard if you got the first two working yourself. You simply have to identify the middle character and the last character, and swap them. You already worked out how to identify the middle character. Finding the last character should be just as easy. And swapping them is just a matter of reassigning those indices of the character array (hint: a temporary variable is need to perform this simple swap).

Try out the third one and post your attempt if you can't solve it.

It will definitely help to sketch it out on paper by hand, to get an idea of the steps needed to solve that problem.