C语言编写1!+2!+3!+.....+n!

#includestdio.hintfun(intn);voidmain(){intn,i,sum=0;printf(n：);scanf(%d,&n);for(i=1;i=n;i++)sum+=fun(i);printf(1!+2!+3!+...+%d!=%d\n,n,sum);}intn;intfun(intn){if(n==1)return1;elsereturnn*fun(n-1);}