阅读程序,写出程序的运行结果。 / /x2-10-1 # i nc1ude< io stream> #include
using namespace std ; int main() { int a= 100 ; double b= 246.343 ; printf("a= % d\n",a) ; printf("2*a= %d \n",2*a) ; printf("a= %2d \n",a) ; printf(" % 3f\n", b) p rin tf(" % 20.2 l f\n",b); pr i ntf(" % -20.2 l f\n",b); pr i ntf(" % .21f\n",b); return 0; }