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                C 語言允許您傳遞指針給函數,只需要簡單地聲明函數參數為指針類型即可。 下面的實例中,我們傳遞一個無符號的 long 型指針給函數,并在函數內改變這個值: ``` #include <stdio.h> #include <time.h> void getSeconds(unsigned long *par); int main () { unsigned long sec; getSeconds( &sec ); /* 輸出實際值 */ printf("Number of seconds: %ld\n", sec ); return 0; } void getSeconds(unsigned long *par) { /* 獲取當前的秒數 */ *par = time( NULL ); return; } ``` 當上面的代碼被編譯和執行時,它會產生下列結果: ~~~ Number of seconds :1294450468 ~~~ 能接受指針作為參數的函數,也能接受數組作為參數,如下所示: ``` #include <stdio.h> /* 函數聲明 */ double getAverage(int *arr, int size); int main () { /* 帶有 5 個元素的整型數組 */ int balance[5] = {1000, 2, 3, 17, 50}; double avg; /* 傳遞一個指向數組的指針作為參數 */ avg = getAverage( balance, 5 ) ; /* 輸出返回值 */ printf("Average value is: %f\n", avg ); return 0; } double getAverage(int *arr, int size) { int i, sum = 0; double avg; for (i = 0; i < size; ++i) { sum += arr[i]; } avg = (double)sum / size; return avg; } ``` 當上面的代碼被編譯和執行時,它會產生下列結果: ~~~ Average value is: 214.40000 ~~~
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