﻿ C Program: Calculate x raised to the power n - w3resource

# C Exercises: Calculate x raised to the power n

## C Programming Mathematics: Exercise-4 with Solution

Write a C program to calculate x raised to the power n (xn).

Example:
Input:
x = 7.0
n = 2

x = 6.2
n = 3
Output:
Result:(x^n) : 49.000000
Result:(x^n) : 238.328000

Visual Presentation:

Sample Solution:

C Code:

``````#include <stdio.h>
#include <limits.h>

// Function to calculate power of x raised to the power n (x^n)
double powxn(double x, int n) {
double k;

// Base case: if n is 0, return 1
if (n == 0)
return 1;

// Recursive calculation of power using divide-and-conquer approach
k = powxn(x * x, n / 2); // Recursively compute x^(n/2)

// If n is odd, multiply k by x once more
if (n % 2)
k = k * x;

return k; // Return the computed value of x^n
}

int main(void)
{
double x = 7.0;
int n = 2;

// Test case 1
printf("\nx = %f, y = %d  ", x, n);
printf("\nResult: (x^n) : %f ", powxn(x, n));

x = 6.2;
n = 3;

// Test case 2
printf("\n\nx = %f, y = %d  ", x, n);
printf("\nResult: (x^n) : %f ", powxn(x, n));

return 0;
}
```
```

Sample Output:

```x = 7.000000, y = 2
Result:(x^n) : 49.000000

x = 6.200000, y = 3
Result:(x^n) : 238.328000
```

Flowchart:

C Programming Code Editor:

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