怎样用递归代替多层for循环

我要创建一个PROJECT,下面有多个ACTIVITY，每个ACTIVITY下面又有多个ACTIVITY，要实现这种模式的PROJECT可以使用多层for循环，代码如下：
for(i=3;i<=3;i++)
    {    
        sprintf(firstName,"%d",i);
        sprintf(userName,"%s%d",lastName,i);
        addUser(userName,password,confirmPassword,firstName,lastName);

        sprintf(jobName,"Project_%s",userName);
        sprintf(projectCode,"P%d",i);
        tempId=addProject(jobName,projectCode,responsibleStr,respGroupStr,startTime,duration);
        printf("tempID: %d",tempId);

        for(j=1;j<=2;j++)
        {        
            sprintf(tAName,"P_V_%d_%d",i,j);
            sprintf(pUName,"admin");
            sprintf(rUName,"admin");
            tParentId=tempId;
            tRootId=tempId;
            tempId2=addActivity(tAName,pUName,rUName,tParentId,tRootId,tPreId,tPreAId,tAStartDate,tADurDate);
            for(k=1;k<=3;k++)
            {
                sprintf(tAName2,"P_V_%d_%d_%d",i,j,k);
                sprintf(pUName2,"admin");
                sprintf(rUName2,"admin");
                tParentId2=tempId2;
                tRootId2=tempId;
                tempPreId2=addActivity(tAName2,pUName2,rUName2,tParentId2,tRootId2,tPreId2,tPreAId2,tAStartDate2,tADurDate2);
                tPreId2=LogicID;
                tPreAId2=tempPreId2;                
            }
        }

但是如果ACTIVITY下面的层数很多的时候，用FOR循环就不好做了，这个时候可以用递归的方面，把层数和每层下面有几个ACTIVITY作为参数传进去，这个递归程序应该如何实现呢？ 3Q
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严重鄙视楼上的。。做广告行为。学习资料应该免费共享。。。。
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