C Exercises: Check if a given integer is a power of three
C Programming Mathematics: Exercise-13 with Solution
Write a C programming to check if a given integer is a power of three.
Example:
Input: 9
Output: true
Input: 81
Output: true
Input: 45
Output: false
Pictorial Presentation:
Sample Solution:
C Code:
#include <stdio.h>
#include <stdbool.h>
static bool is_PowerOf_Three(int n) {
#if 0
if (n == 1) return true;
if (n == 0 || n % 3) return false;
return is_PowerOf_Three(n / 3);
#else
return (n > 0 && (1162261467 % n) == 0);
#endif
}
int main(void)
{
int n = 9;
printf("\nIf %d is power of three? %d", n, is_PowerOf_Three(n));
n = 81;
printf("\n\nIf %d is power of three? %d", n, is_PowerOf_Three(n));
n = 45;
printf("\n\nIf %d is power of three? %d", n, is_PowerOf_Three(n));
return 0;
}
Sample Output:
If 9 is power of three? 1 If 81 is power of three? 1 If 45 is power of three? 0
Flowchart:
C Programming Code Editor:
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Previous: Write a C programming to add repeatedly all digits of a given non-negative number until the result has only one digit.
Next: Write a C programming to calculate the number of 1's in their binary representation and return them as an array.
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C Programming: Tips of the Day
Static variable inside of a function in C
The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().
The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().
Ref : https://bit.ly/3fOq7XP
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