放入输入时的变量名称替换

Question

int var_lib_check(char *type, char *var)
{
    static char var_library[MAX_VARS][MAX_LINE];
    static char new_var[MAX_LINE];
    static int num_of_var;
    int z;

    if (strcmp(type, DOUBLE_TYPE) == 0 || strcmp(type, INT_TYPE) == 0 ||
            strcmp(type, RTRN_TYPE)==0)
    {
        for (z = 0 ; z < num_of_var ; z++)
        {
            if (strcmp(var_library[z], var) == 0)
            {
                sprintf(new_var, "x%d", z);
                printf("%s %s\n", type, new_var);
                return z;
            }
        }
        strcpy(var_library[num_of_var], var);
        sprintf(new_var, "x%d", num_of_var);
        printf("%s %s\n", type, new_var);
        num_of_var += 1;
    }
    return num_of_var;
}

如何修改我的var_lib_check()以将变量名称替换应用于另一个类语句：来自表达式的赋值语句是单个变量，总和，乘积，除法，两个变量的减法？

例如：

double malcolm; would be double x0;.  
int zoe; would be int x1;.  
zoe=wash; would be x1=x2;.  
malcolm=wash*river; would be x0=x2*x3;.