c語言編寫程序題: 計(jì)算分段函數(shù)，f(x)={ 2x 1(當(dāng)x>0時(shí)) 0(當(dāng)x=0時(shí)) 1/x(當(dāng)x

c語言編寫程序題: 計(jì)算分段函數(shù)，f(x)={ 2x 1(當(dāng)x>0時(shí)) 0(當(dāng)x=0時(shí)) 1/x(當(dāng)x<0時(shí))輸入x，計(jì)算函數(shù)并輸出&#？

1#include<stdio.h>intmain（）{doublexwhile（scanf（%lf”，&x）==1）{if（x==0）printf（%0n”）elseif（x>0）printf（%lfn”，2*x1） elseprintf（%lfn，1/x）}return0}2#include<stdio.h>ints[13]={0,31,28,31,30,31,30,30,30,31,31}intmain（）{inty，m，d，i，sumwhile（scanf（%d%d”，&y，&m，&d）==3）{sum=0for（i=1i<mi）sum=s[i]sum=dif((y@0==0||（y  0！=0&&&；amp&；amp&；amp&；amp&；amp&；amp&；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；amp；gt；2）sum printf（%dn，sum）}return0}3#include<stdio.h>；intf（intn）{if（n==1）return1elsereturnn*f（n-1）}intmain（）{printf（%dn，f（9）-