gdb——但不执行和跟踪函数

int add_range(int low, int high);

int main(int argc, char *argv[])

{

int result[100];

result[0] = add_range(1,10);

result[1] = add_range(1,100);

printf("result[0]=%d\nresult[1]=%d\n", result[0], result[1]);

    return 0;

}

int add_range(int low , int high)

{

    int i, sum;

    for(i = low; i <= high; i++)

        sum = sum + i;

    return sum;

}