Question

Problem 5 (10 points) Write a C program, called sort3.c, that performs the following task. The program first prompts the user to enter three integers a, b, and c. It then sorts these integers in ascending order, so that swapping their values if necessary. Finally, the program prints the three integers entered by the user in ascending order. Here are a few sample runs of the program /home/userXYZ/ECE15/Final> sort3 Please enter three integers: 3 2 1 Here are the integers in ascending order: 1 2 3 /home/userXYZ/ECE15/Final> sort3 Please enter three integers: 42 -18 0 Here are the integers in ascending order: -18 0 42 /home/userXYZ/ECE15/Final> sort3 Please enter three integers: 1 2 3 Here are the integers in ascending order: 1 2 3 /home/userXYZ/ECE15/Final> sort3 Please enter three integers: 2 1 2 Here are the integers in ascending order: 1 2 2 In this problem, you do not need to verify the validity of the user input. You should assume that the user indeed enters three integers when prompted to do so There are many different ways to sort three integers a, b, c so that a b c. Here is one simple way that works. Perform the following sequence of three conditional swaps, in the specified order if a >b, swap a and b; if b >c, swap b and c if a > b, swap a and b; You can use the above method or any other method of your choice, but you are required to call the function sort-three () in order to sort a, b, and c. Moreover, the sorting has to be accomplished in place. In particular, you are not allowed to declare and use any variables inside the sort three( function. This function, however, can call other functions (such as the swap () function) that you will need to implement separately. Note that you are not allowed to use any functions from the C standard library, except for those declared in <stdio.h>.

Answer 1

HI,
here is the full code with comments

#include <stdio.h>
void swap(int *xp, int *yp) //function to swap values
{
int temp = *xp;
*xp = *yp;
*yp = temp;
}
void sort_three(int* a,int* b,int* c)//function to sort three integers
{
if (*a > *c)//if a>c swap
swap(a, c);

if (*a > *b)//if a>b swap
swap(a, b);

if (*b > *c)//at this point the smallest is at last, so swap
swap(b, c);
}
int main()
{
int a,b,c;
printf("Please enter three integers\n");
scanf("%d%d%d",&a,&b,&c);
sort_three(&a,&b,&c);//calling the function
printf("In ascending order:");
printf("%d %d %d",a,b,c);
return 0;
}
o/p-

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