The gmp_scan1() is an inbuilt function which is used to scan “1” in the GMP number(GNU Multiple Precision : For large numbers) starting from given index which move towards most significant bits in the number.
Parameters: This function accepts two parameters as explained below:
- $num: This parameter is a GMP number and is mandatory to be passed. This parameter can be a GMP object in PHP version 5.6 and later, or we are also allowed to pass a numeric string provided that it is possible to convert that string to a number.
- $index: This parameter represents the index or position in the bitwise representation of the number $num from where we want to start the search.
Return Value: The function returns the position where we find “1” in the number.
Input : gmp_scan1("101111101", 6) Output : 8 Input : gmp_scan1("111001111", 2) Output : 3
Below programs illustrate the gmp_scan1() function in PHP:
Program 1: Program to find the position of “1” bit in GMP number when numeric strings as GMP numbers are passed as arguments.
Program 2: Program to find the position of “1” bit in GMP number when GMP numbers are passed as arguments.