c语言编写程序题: 计算分段函数,f(x)={ 2x+1(当x>0时) 0(当x=0时...答:1 include<stdio.h> int main(){ double x;while(scanf("%lf",&x) == 1) { if(x == 0) printf("0\n");else if(x>0) printf("%lf\n",2*x+1);else printf("%lf\n",1/x);} return 0;} 2 include<stdio.h> int s[13] = {0,31,28,31,30,31,30,31,31,30,31...