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tags: DICE C
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16-8 等比級數公式
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> [name=CHAWTeam]

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目錄：[DICE C語言程式破解](https://hackmd.io/@CHAWTeam/DiceC)

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題目
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輸入3個整數，

分別為首項、末項與公比，求等比數列之和。

輸入範例:
2 32 2

輸出範例:
62

程式碼
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#include <stdio.h>

int main()
{
    int first, last, commonRatio, sum = 0;
    scanf("%d %d %d", &first, &last, &commonRatio);
    for ( ; last >= first; first *= commonRatio)
    {
        sum += first;
    }
    printf("%d", sum);
    return 0;
}

執行
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2 32 2
62

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目錄：[DICE C語言程式破解](https://hackmd.io/@CHAWTeam/DiceC)

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