float Data Type in C: Usage and Examples

• Float data type allows a variable to store decimal values.
• Storage size of float data type is 4. This also varies depend upon the processor in the CPU as “int” data type.
• We can use up-to 6 digits after decimal using float data type.
• For example, 10.456789 can be stored in a variable using float data type.

  Example:

  float f1 = 234.5

Storage size of float

float Variable Declaration and Variable Initialization:

Variable Declaration : To declare a variable , you must specify the data type & give the variable a unique name.

float pi ;

Variable Initialization : To initialize a variable you must assign it a valid value.

float = 3.14 ;

float Variable Declaration and Variable Initialization in two steps:

float pi;
pi = 3.14;

Program

#include<stdio.h>
  
void main() {
    float pi;
    pi = 3.14;
    printf("%f\n",pi);
 } 

Output

When you compile and execute the above program, it produces the following result

3.140000
Press any key to continue . . .

float Variable Declaration and Variable Initialization in one line:

float pi
 = 3.14;

Program

#include<stdio.h>
  
void main() {
    float pi = 3.14;
    printf("%f\n",pi);
 } 

Output

When you compile and execute the above program, it produces the following result

3.140000
Press any key to continue . . .

Example of float

Program

#include<stdio.h>
  
void main() {
// this is declaration and initialization of variable a
	  // datatype is float
	  float a = 234.5 ;
	  // this is declaration and initialization of variable b
	  // datatype is float
      float b = 234.565 ;
      printf("%f \n",a); // it will print a variable
      printf("%f \n",b); // it will print b variable
 } 

Output

When you compile and execute the above program, it produces the following result

234.500000
234.565002
Press any key to continue . . .