int，float和double类型；char类型和char数组（字符串）；printf和scanf

1，int，float和double类型 int i； int j , k ; (同时声明多个) int age=18 ; (声明的同时赋值) int Alan, Aloe = 18 ; (声明与同时赋值) float f ; float q , money ; (同时声明多个) float w = 1.8; (声明的同时赋值) 2, char 类型和char数组： char c ; char zh,text ; char letter = 'A' ; char c[20] = {'H','e','l','l','o','','w','o','r','l','d',''}; char name[] = {'A','l','a','n'}; (name后的[ ]可以是空的，电脑自己会计算字符的个数) 3，printf和scanf printf("Alan的年龄是%d", age ); scanf("%d", &i);