swap the value of 5.34 to 2.0

Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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i want to swap the value of 5.34 to 2.0 in the latter part what should I do? thank you in advance for your idea and help

 

 

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

int main()//MAIN
{
    char c_1920213 = 'A';
    char *pcc_1920213 = &c_1920213; /* pc points to c*/
    double  dc_1920213 = 5.34;
    double *pd1c_1920213, *pd2c_1920213;
    
   printf("VALUE OF C BEFORE POINTER: %c", *pcc_1920213);
    
    
    *pcc_1920213 = 'B'; /* Dereferenced  pointer: c is now equal to 'B'. */
      printf("\nVALUE OF C AFTER POINTER: %c \n", *pcc_1920213);
      
    pd1c_1920213= &dc_1920213;  /* pd1 points to d */
    printf("VALUE OF pd1 BEFORE POINTER: %lf ", *pd1c_1920213);
    
    pd2c_1920213= pd1c_1920213; /*pd2 and pd1 now both point to d */
     printf(" \nVALUE OF pd1 AFTER POINTER: %lf ", *pd1c_1920213);
    *pd1c_1920213 = *pd2c_1920213  *2.0; /* equivalent to d = d * 2.0; */
    
}
    

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