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                ## rand ## 產生隨機數 ### 相關函數 ### srand,random,srandom ### 表頭文件 ### ``` #include<stdlib.h> ``` ### 定義函數 ### ``` int rand(void); ``` ### 函數說明 ### rand()會返回一隨機數值,范圍在0至RAND_MAX 間。在調用此函數產生隨機數前,必須先利用srand()設好隨機數種子,如果未設隨機數種子,rand()在調用時會自動設隨機數種子為1。關于隨機數種子請參考srand()。 ### 返回值 ### 返回0至RAND_MAX之間的隨機數值,RAND_MAX定義在stdlib.h,其值為2147483647。 ### 范例 ### ``` /* 產生介于1 到10 間的隨機數值,此范例未設隨機數種子,完整的隨機數產生請參考 srand()*/ #include<stdlib.h> main() { int i,j; for(i=0;i<10;i++) { j=1+(int)(10.0*rand()/(RAND_MAX+1.0)); printf(“%d “,j); } } ``` ### 執行 ### ``` 9 4 8 8 10 2 4 8 3 6 9 4 8 8 10 2 4 8 3 6 ```
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