1.A

2.  6 2 3 4 5 

3.  D

4.  5

5.D

 6.   0x7fffb6514a90, 0x7fffb6514a90, 0x7fffb6514a90, 0x7fffb6514aa4, 19, 1
 

7.

#include<stdio.h>
double Swap(double *a,double *b);
int main(){
	double x = 80.0,y =90.0;
	Swap(&x,&y);
	printf("x=%f,y=%f",x,y);
	return 0;
}
double Swap(double *a,double *b){
	double temp;
	temp = *a;
	*a = *b;
	*b = temp;
}

#include<stdio.h>
double Swap(double x,double y);
int main(){
	double a = 100.0,b = 200.0;
	Swap(a,b);
	printf("a=%f,b=%f",a,b);
	return 0;
}
double Swap(double x,double y){
	double temp;
	temp = x;
	x = y;
	y = temp;
}

8. 

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

void bubble_sort(float *arr, int n) {
    float temp;
    int i, j;
    for (i = 0; i < n - 1; i++) {
        for (j = 0; j < n - i - 1; j++) {
            if (*(arr + j) > *(arr + j + 1)) {
                temp = *(arr + j);
                *(arr + j) = *(arr + j + 1);
                *(arr + j + 1) = temp;
            }
        }
    }
}

int main() {
    int i;
    float arr[5], temp;

    printf("Enter 5 real numbers: ");
    for (i = 0; i < 5; i++) {
        scanf("%f", &arr[i]);
    }

    bubble_sort(arr, 5);

    printf("Sorted numbers in descending order:\n");
    for (i = 0; i < 5; i++) {
        printf("%.2f ", arr[i]);
    }

    return 0;
}