C Tutorial/Data Type/Double

Get size and address for a double

<source lang="cpp">#include<stdio.h> int main(void) {

 double d = 4.0;
 double e = 5.0;
 double f = 6.0;
 printf("\n\nA variable of type double occupies %d bytes.", sizeof(double));
 printf("\nHere are the addresses of some variables of type double:");
 printf("\nThe address of d is: %p  The address of e is: %p", &d, &e);
 printf("\nThe address of f is: %p\n", &f);
 return 0;

}</source>

A variable of type double occupies 8 bytes.
     Here are the addresses of some variables of type double:
     The address of d is: 9a378  The address of e is: 9a370
     The address of f is: 9a368

Use sscanf to get and then double a number from the user

<source lang="cpp">#include <stdio.h>

   int main() 
   {  
       char  line[100];  
       int   value;   
       printf("Enter a value: "); 
       fgets(line, sizeof(line), stdin);  
       sscanf(line, "%d", &value);
       printf("Twice %d is %d\n", value, value * 2);  
       return (0);
   }</source>

Enter a value: 123
Twice 123 is 246