C Double Specifier

Introduction

In C programming language, double is a floating-point data type that represents a double-precision 64-bit number. It is used when higher precision is required in calculations compared to the float data type.

Declaration

To declare a variable of double data type, use the following syntax:

double variable_name;

For example:

double num1 = 3.14159;
double num2;
num2 = 2.71828;

Initialization

The double data type can be initialized using various methods, as shown below:

double num1 = 3.14159;
double num2 = 2.71828;
double num3 = num1 + num2;
double num4 = 1.23e-5;
double num5 = 1.23e6;

Operations

The following operations can be performed on double data type:

Arithmetic Operations

double num1 = 10.5;
double num2 = 5.5;

double sum = num1 + num2;   // 16
double diff = num1 - num2;  // 5
double product = num1 * num2;  // 57.75
double quotient = num1 / num2;  // 1.90909

Comparison Operations

double num1 = 10.5;
double num2 = 5.5;

int isEqual = num1 == num2;   // 0 (false)
int notEqual = num1 != num2;  // 1 (true)
int greaterThan = num1 > num2;  // 1 (true)
int lessThan = num1 < num2;  // 0 (false)
int greaterOrEqual = num1 >= num2;  // 1 (true)
int lessOrEqual = num1 <= num2;  // 0 (false)

Other Operations

double num1 = 10.5;

double absValue = fabs(num);   // 10.5
double roundValue = round(num);  // 11
double ceilValue = ceil(num);   // 11
double floorValue = floor(num);  // 10
double powerValue = pow(num, 2);  // 110.25

Conclusion

This article has covered the double data type in C programming language, including declaration, initialization, and operations. It is important to understand how to use double data type whenever higher precision is required in calculations compared to the float data type.