exponent - Why can we not use a variable as value of e in C -

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My compiler keeps this error in error that I need to use one digit for this:

Xek

Where R is the power for the rendering function such as X, such as X: 

  double x; For (int k = 1; k & lt; 10; k ++) {x = 4ek; }    
 
 
  e  for the floating point number in C It has the special code specification % e  and % E , which is to print a temporary point number in  e  notation. But neither the exponents nor the Mantissa can be variable. .  
  x = 4.0e7;  Completely okay.  
 But for variable power, you need to use the standard  math  library function  exp  or  pow .  
  x = pow (4, k);   
 or  
  x = 4 * exp (k);   
 The way you are using it in a loop, you can customize it by assuming the last count value as follows: ( x  is being started on  1 .)  
  x = x * 4;   
 Each time the loop runs  x  is multiplied by  4 , so basically  k  th Loop run  x = 4 * exp (k); .

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