n的阶乘和计算1!+2!+3!+........+n!

n阶乘：1x2x3x4……xn函数 int main() { int n ; scanf("%d", &n); int sum = 1 ; int i = 1; for (; i <= n; i++) { sum=sum*i; } printf("%d\n", sum); system("pause"); return 0; } 计算1!+2!+3!+..

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