C Exercises: Check whether a given number is a perfect cube or not

Last update on August 05 2025 12:55:54 (UTC/GMT +8 hours)

29. Ideal Cube Check Variants

Write a program in C to check whether a given number is an ideal cube or not.

Test Data
Input a number: 125

Sample Solution:

C Code:

# include <stdio.h>
# include <stdlib.h>
# include <math.h>

int main() 
{ 
    int num, curoot, ans; // Declaring variables: 'num' for the input number, 'curoot' for the cube root, 'ans' for the answer

    // Printing information about the program and asking for user input
    printf("\n\n Check whether a number is a perfect cube or not: \n");
    printf(" -----------------------------------------------------\n");
    printf(" Input a number: ");
    scanf("%d", &num); // Reading the input number from the user

    curoot = round(pow(num, 1.0 / 3.0)); // Calculating the cube root using the 'pow' function

    // Checking if the cube of 'curoot' is equal to the input number 'num'
    if (curoot * curoot * curoot == num)
    {
        printf(" The number is a perfect Cube of %d \n", curoot); // Printing if the number is a perfect cube and displaying its cube root
    }
    else
    {
        printf(" The number is not a perfect Cube.\n"); // Printing if the number is not a perfect cube
    }
}

Sample Output:

 Input a number: 125                                                                                          
 The number is a perfect Cube of 5

Visual Presentation:

C programming: Check whether a given number is a perfect cube or not.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to check if a number is a perfect cube by computing its integer cube root.
Write a C program to verify ideal cubes using integer arithmetic to avoid floating-point errors.
Write a C program to test cube properties by comparing results from power functions and iterative methods.
Write a C program to determine if a number is an ideal cube by iterating through potential cube roots.

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