c语言变量和常量的使用1

#include <stdio.h> int main() { double income;//垃圾数据 short int pen, notebook;//垃圾数据 int age = 40;//指定值初始化 double salary = 1234.56, weight = 78.9;//指定值初始化 printf("pen=%hd,notebook=%hd\n",pen,notebook); printf("income=%lf\n",income); printf("age=%d\n", age); printf("salary=%lf, weight=%lf\n", salary,weight); age = 18;//赋值 printf("age=%d\n", age); age = age - 10;//赋值 printf("age=%d\n", age); return 0; }