C program to read a string and rewrite it in the alphabetical order

/* C program that will read a string and rewrite it in the alphabetical order. i.e. the word STRING should be written as GINRST. */

#include"stdio.h"

#include"string.h"

void main()

{

char str[20], k;

int i, j;

printf("Enter a string: \n");

scanf("%[^\n]", str);

for(i=0; str[i] != '\0'; i++)

{

for(j=i+1; str[j] != '\0'; j++)

{

if(str[i] > str[j])

{

k= str[i];

str[i] = str[j];

str[j] = k;

}

}

}

printf("%s", str);

printf("\n");

}

Output: