c语言中3!+6!+9!+12!+15!+18!+21!如何编程
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c语言中3!+6!+9!+12!+15!+18!+21!如何编程
c语言中3!+6!+9!+12!+15!+18!+21!如何编程
c语言中3!+6!+9!+12!+15!+18!+21!如何编程
double确实不够,20!的话还凑活,21!刚好超, long long int也一样,用long double吧
#include
int main()
{
\x09int i;
\x09long double sum,t;
\x09for(i=1,t=1,sum=0;i