如何在字符串char []中的两个字母之间交换？

Question

Sorry for the title, but I don't know what is this program called.

I'm trying to write a program that takes an int parameter and print a word of length n that consists of both letters 'a' and 'b' for example:

n= 3 
the result =>: `aaa,baa,aba,aab,bba,bab,abb,bbb`

And this is my code. There is something wrong in it:

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

#define n  5

char word[n] = "aaa";
char noob[n];

void
myfunction(void)
{
    int x,
     i,
     j;

    for (i = 0; i < n - 1; i++) {
        // I did this to convert first from a char to int and then add one in
        // order to change a to b
        x = word[i];
        x++;
        word[i] = x;
        puts(word);

        // here is the problem after going through the first loob (i) we have
        // the word baa and it should go through the second loop j but it
        // doesn't
        for (j = 0; j < n - 1; j++) {
            noob[j] = word[j];
            word[j + 1] = word[j];
            word[j] = noob[j];
            puts(word);
        }

    }
}

int
main(void)
{
    myfunction();

    return 0;
}

can someone help me please ???

Answer 1

Just do char word[n] = "aaaaa";

Full code:

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

#define n  5

char word[n] = "aaaaa";
char noob[n];

void
myfunction(void)
{
    int x, i, j;

    for (i = 0; i < n - 1; i++) {
        // I did this to convert first from a char to int and then add one in
        // order to change a to b
        x = word[i];
        x++;
        word[i] = x;
        puts(word);

        // here is the problem after going through the first loob (i) we have
        // the word baa and it should go through the second loop j but it
        // doesn't
        for (j = 0; j < n - 1; j++) {
            noob[j] = word[j];
            word[j + 1] = word[j];
            word[j] = noob[j];
            puts(word);
        }

    }
}

int
main(void)
{
    myfunction();

    return 0;
}

Of course this work when you know the length of your words at compile time. It the length would be known only at runtime (for example with a user inputting it) you need do dynamically allocate (with malloc for example) and remove.