C Exercises: Demonstrate the working of keyword long

Last update on July 29 2025 12:55:08 (UTC/GMT +8 hours)

18. Demonstrating the 'long' Keyword

Write a C program to demonstrate the working of the keyword long.

Sample Solution:

C Code:

#include<stdio.h>      // Include the standard input/output header file.

int main()           // Start of the main function.
{
int a;            // Declare an integer variable 'a'.
long b;           // Declare a long integer variable 'b'.
long long c;      // Declare a long long integer variable 'c'.
double e;         // Declare a double precision floating-point variable 'e'.
long double f;    // Declare a long double precision floating-point variable 'f'.

printf("\n Demonstrate the working of keyword long \n");   // Print a header message.
printf("------------------------------------------\n");  // Print a separator line.

printf(" The size of int = %ld bytes \n", sizeof(a));      // Print the size of 'a'.
printf(" The size of long = %ld bytes\n", sizeof(b));      // Print the size of 'b'.
printf(" The size of long long = %ld bytes\n", sizeof(c)); // Print the size of 'c'.

printf(" The size of double = %ld bytes\n", sizeof(e));    // Print the size of 'e'.
printf(" The size of long double = %ld bytes\n\n", sizeof(f)); // Print the size of 'f'.

return 0;   // Return 0 to indicate successful execution of the program.
}   // End of the main function.

Sample Output:

 Demonstrate the working of keyword long                                                                      
------------------------------------------                                                                    
 The size of int = 4 bytes                                                                                    
 The size of long = 8 bytes                                                                                   
 The size of long long = 8 bytes                                                                              
 The size of double = 8 bytes                                                                                 
 The size of long double = 16 bytes

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to print the sizes of int, long, and long long data types using the sizeof operator.
Write a C program to perform arithmetic operations on long integers and observe the effects of overflow.
Write a C program to declare a long double variable and perform high-precision arithmetic calculations.
Write a C program to demonstrate implicit type conversion between int, long, and float values and print the results.

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