関数レベルおよびメソッドレベルメトリック

void foo(int i)
{
    /* This function has two independent paths, resulting in the metric being equal to ln(2) = 0.693 */
    if (i > 0) {
        /* This is one independent path */
    } else {
        /* This is the second independent path */
    }
}

void bar(int i)
{
    /* Nested control flow statements increase the number of paths in the branches where they are present,
       for every path at the beginning of that control flow statement */
    /* This function has nine independent paths, resulting in the metric being equal to ln(9) = 2.197 */
    if (i > 0) {
        /* First independent path */
        for (int j = 0; j < i; ++j) {
            /* Still the first independent path */
        }
        /* Second independent path (corresponding to j >= i) */
        /* There are two independent paths at the entry of this control flow statement.
           For each of them, the statement introduces 3 more independent paths */
        switch (i) {
            case 1: 
                /* Still the part of the first or second original independent paths */
                break;
            case 2: 
                /* 3-rd and 4-th independent paths */
                break;
            case 3: 
                /* 5-th and 6-th independent paths */
                break;
            default: 
                /* 7-th and 8-th independent paths */
                i++;
        }
    } else {
        /* 9-th independent path */
    }
}