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Finding power of a number is a very common operation in programming logic. In this article we will understand how to write a program by using Power Function In C to calculate power of a number. Following pointers will be covered in this article,
Let us start with understanding how to write a program to calculate power of a number.
23 = 2*2*2 = 8
To find the 2^3, you need to multiply 2 thrice. This can be simply achieved using for loop.
For above example, base = 2, exponent = 3.
for (exponent=3; exponent>0; exponent--) { result = result * base; }
Let’s look at the C program implementing the same.
Example
#include <stdio.h> int main() { int base, exponent; int result = 1; printf("Enter a base number: "); scanf("%d", &base); printf("Enter an exponent: "); scanf("%d", &exponent); for (exponent; exponent>0; exponent--) { result = result * base; } printf("Answer = %lld", result); return 0; }
Output:
Moving On with this article on Power Function In C
You can also create a function to calculate the power which you can call anytime you want to calculate the power of any integer.
int power(int base, int exponent) { int result=1; for (exponent; exponent>0; exponent--) { result = result * base; } return result; }
Let’s look at the complete code how to use this function.
Example
#include <stdio.h> int power(int base, int exponent){ int result=1; for(exponent; exponent>0; exponent--){ result = result * base; } return result; } int main() { int base, exponent; printf("Enter a base number: "); scanf("%d", &base); printf("Enter an exponent: "); scanf("%d", &exponent); int res = power(base, exponent); printf("Answer = %lld", res); return 0; }
Output:
This technique only works if the exponent is a positive integer. If you want to find the power of a number where the exponent is a real number, you need to use pow() function.
Moving On with this article on Power Function In C
#include <math.h>
The declaration of the power function is as follows:
Declaration: double pow(double base, double exponent);
pow(2.4, 3.2)
where 2.4 is the base & 3.2 is the exponent
Let’s quickly look at an example to understand how to use pow() function in a program.
Example:
#include <stdio.h> #include <math.h> int main() { double base, expo, res; printf("Enter a base number: "); scanf("%lf", &base); printf("Enter an exponent: "); scanf("%lf", &expo); res = pow(base, expo); printf("%.1lf^%.1lf = %.2lf", base, expo, res); return 0; }
Output
Now, after executing the above programs you would have understood how to use power function in C. I hope this article was informative and added value to you.
Stay tuned for more tutorials on similar topics.You may also checkout our training program to get in-depth knowledge on jQuery along with its various applications, you can enroll here for live online training with 24/7 support and lifetime access. Implement the above code with different strings and modifications. Now, we have a good understanding of all key concepts related to the pointer.
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