To count the number of elements in an array matching a condition R, we can follow the following steps:
1. Initialize a variable count to 0, which will keep track of the number of elements that match the condition R.
2. Use a loop to go through each element in the array.
3. Check if the element satisfies the condition R using an if statement.
4. If the condition is satisfied, increment the count variable by 1.
5. Repeat steps 3-4 for each element in the array.
6. Once the loop finishes, the count variable will contain the number of elements that match the condition R.
Here's an example code snippet in Python that counts the number of elements in an array that are greater than 5:
array = [2, 6, 8, 3, 9, 1, 4, 7]
count = 0
for element in array:
if element > 5:
count += 1
print("Number of elements greater than 5:", count)
Output:
Number of elements greater than 5: 4
In this example, we first define an array array with 8 elements. We then initialize the variable count to 0. We use a loop to go through each element in the array, and check if the element is greater than 5. If it is, we increment count by 1. Once the loop is done, we print the value of count, which tells us how many elements in the array are greater than 5. In this case, the output is 4, since there are 4 elements in the array that are greater than 5.