c - for 循环发出警告 : expression result unused [-Wunused-value]

Question

我已经盯着它看了很久，但不明白为什么它会在 for 循环语句中给我一个警告。

//looks for a certain account by name in the provided list, return index 
//of account if found, else -1

int AccountSearch(BankArray bank, char name[100])
{
    int i = 0;
    for(i ; i < maxAccounts ; i++)
    {
        /* if this index contains the given value, return the index */
        if (strcmp(bank->list[i]->accountName, name) == 0)
        { 
            return i;
        }
    }

    /* if we went through the entire list and didn't find the 
     * value, then return -1 signifying that the value wasn't found
     */
    return -1;

}

Answer 1

for 循环中的第一个表达式未被使用，它等同于编写

i;

改成

for (; i < maxAccounts ; ++i)

或者更好，因为它只在第一次发现循环时执行，所以用它来初始化和声明i，像这样

for (int i = 0 ; i < maxAccounts ; ++i)