#include <stdio.h>
int main(){
    int value;
    int iErr;

    printf("Value to examine: ");
    
    iErr = scanf("%d",&value);

    if(iErr != 1){
        printf("Unable to read the value\n");
        return 0;
    }
    if(value <= 0) {
        printf("Value must be positive\n");
        return 0;
    }
    int binaryArray[32];
    int arrayLength = 0;
    while(value > 0) {
        binaryArray[arrayLength] = value % 2;
        value = value/2;
        arrayLength++;
    }
    int counter = 0;
    for(int i = arrayLength; i > 0; i--) {
        if (binaryArray[i] == 1) {
            counter++;
        }
    }
    printf("Number of ones: %d", counter);
    return 0;
}