Question

Solve this problem using pointer variables wherever possible.

to be completed in C

Problem -  sort 3 numbers

Modify the sort 3 program you previously wrote, to use pointers.  In main( ) read 3 numbers from the user into low, medium, high, then call a function to “sort” them. That is, if low = 50, medium = 10 and high = 30 before the function is called, then after the function call the variables will contain low = 10, medium = 30 and high = 50.  Print out the values of low, medium and high before and after the function call.

The “sort” function needs only 3 separate if statements (with no else).  Each if statement should call a swap function.  The first two if statements should ensure that low has the correct value.  The final if statement will ensure medium and high are correct.

The code for the “sort” function and swap function should come after main( ) so you’ll need prototypes.  All parameter passing should be done via pointers.

In main call the “sort” function with these 3 different data sets, writing out the values for low, medium and high before and after calling the “sort” function in each case:

            low = 50, medium = 10, high = 30

            low = 30, medium = 50, high = 10

            low = 50, medium = 30, high = 10

Note: think very carefully about the parameters in each function.

Answer 1

Hey,

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#include<stdio.h>
void swap(int* a,int* b)
{
int temp=*a;
*a=*b;
*b=temp;
}
void sort(int* low,int* medium,int* high)
{
if (*low > *high)
swap(low, high);

if (*low > *medium)
swap(low, medium);

//Now the smallest element is the first one. Just check the 2-nd and 3-rd

if (*medium > *high)
swap(medium, high);
}
int main()
{
int low=50,medium=10,high=30;
printf("Values before function are low=%d, medium=%d and high=%d ",low,medium,high);
sort(&low,&medium,&high);
printf("Values after function are low=%d, medium=%d and high=%d ",low,medium,high);
low=30;
medium=50;
high=10;
printf("Values before function are low=%d, medium=%d and high=%d ",low,medium,high);
sort(&low,&medium,&high);
printf("Values after function are low=%d, medium=%d and high=%d ",low,medium,high);
low=50;
medium=30;
high=10;
printf("Values before function are low=%d, medium=%d and high=%d ",low,medium,high);
sort(&low,&medium,&high);
printf("Values after function are low=%d, medium=%d and high=%d ",low,medium,high);

}

Kindly revert for any queries

Thanks.