text: Find whether a given number is a power of 4 or not | C program to check if given number is power of 4 or not ; Driver program to test above function
code: #include <stdio.h> NEW_LINE #define bool  int NEW_LINE bool isPowerOfFour ( unsigned int n ) { return n != 0 && ( ( n & ( n - 1 ) ) == 0 ) && ! ( n & 0xAAAAAAAA ) ; } int main ( ) { int test_no = 64 ; if ( isPowerOfFour ( test_no ) ) printf ( " % d ▁ is ▁ a ▁ power ▁ of ▁ 4" , test_no ) ; else printf ( " % d ▁ is ▁ not ▁ a ▁ power ▁ of ▁ 4" , test_no ) ; getchar ( ) ; }