C语言基础教程 C语言入门教程

#include <stdio.h> #define P 3.14//宏定义 void test(); main() { //test(); /*int num1,num2,num3=9; num1=45; num2=99; //取地址 printf("%d\n%d\n%d\n",&num1,&num2,&num3); //取值 printf("%d\n%d\n%d\n",num1,num2,num3); */ float num=0.45464565; printf("%e\n",num); /*int i=2; float num; num=i*P; printf("%f\n",num); */ } void test() { int num; printf("你好！！！\nnum="); scanf("%d",&num); printf("%d\n",num); printf("%d\n",&num); }