vector.missing.values <- function(V) {
    if (!(NA %in% V)) {
        print("No missing value")
    } else {
        cat('Total number of missing values: ', sum(is.na(V)),'\n')
        return(which(V %in% NA))
    }
}
problem.1.test.vector.1 <- c(5, 7, 2, 4, NA, 6, 9, 10)
problem.1.test.vector.2 <- c(36.5, 41.9, 53.8, NA, 37.4, 46.1, NA, NA, 54.9)
problem.1.test.vector.3 <- c(103.4, 256.8, 189.5, 177.4, 218.3, 224.6)

vector.missing.values(problem.1.test.vector.1)
vector.missing.values(problem.1.test.vector.2)
vector.missing.values(problem.1.test.vector.3)