Long Data Type in C

January 19, 2023

Long Keyword

On this page we will discuss about Long Data Type which is used in C. The Long data type is a data type that represents a signed integer that is typically at least 32 bits long.

long data type in C

More About Long Keyword in C Language

In C Programming, long data type is used to store larger integer values that are too large to be stored in a int data type.

The long data types with their storage size, range and format specifier are given in the table below:

Data TypeStorage sizeRangeFormat Specifier
long4 bytes-2,147,483,648 to +2,147,483,647%ld
long long8 bytes-9,223,372,036,854,775,808 to +9,223,372,036,854,775,807%lld
long double10 bytes3.4E-4932 to 1.1E+4932%lf

The range of values that can be stored in a long variable depends on the implementation of the C compiler and the specific system it is being run on.

Declaration of Long Data type variable

long p;
long long q;
long double r;
Here variables p and q can store integer values and r variable can store a floating-point number.

Initialization of Long Data type variable

A long data type variable can be initialized in two ways as follows:

1. By assigning value to a variable using assignment operator.

p = 1234567890;
q = 123456789012345678;
r = 5.67e+2;

2. By assigning value to a variable during declaration only using an assignment operator.

long p = 1234567890;
long long q = 123456789012345678;
long double r = 5.67e+2;
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int

short

float

double

char

Program to print Long Data Types

Example 1:

Run 
#include <stdio.h>

int main() {
    // Declare a long variable and initialize it with a value
    long num = 1234567890;

    // Print the value of the long variable
    printf("The value of num is: %ld\n", num);

    // Add two long variables and store the result in another long variable
    long result = num + 1234567890;
    printf("The result is: %ld\n", result);

    return 0;
}

Output:

The value of num is: 1234567890
The result is: 2469135780

Example 2:

Run 
#include <stdio.h>

int main() {
    
    // Declare a long double variable and initialize it with a value
    long double num = 123.456789012345678;

    // Print the value of the long double variable
    printf("The value of num is: %Lf\n", num);

    // Add two long double variables and store the result in another long double variable
    long double result = num + 123.456789012345678;
    printf("The result is: %Lf\n", result);

    return 0;
}

Output:

The value of num is: 123.456789
The result is: 246.913578

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