100% C prog to write content into a file and then read it back onto the console

//program to swap two numbers using third variable called 'temp'
#include <stdio.h>
void main()
{
     float temp,a=18.57,b=19.47;
   
     printf("\n values of a and b before swapping are %f and %f respectively",a,b);
     temp=a;
     a=b;
     b=temp;
     printf("\n values of a and b after swapping are %f and %f respectively",a,b);    
     
}

output ఇలా వచ్చె 

values of a and b before swapping are 18.570000 and 19.469999 respectively
 values of a and b after swapping are 19.469999 and 18.570000 respectively