# include <stdio.h>void main(){ /* 定义变量并赋初值 */ int a = 5; char c = 'a'; float f = 5.3; double m = 12.65; double result; /* 同类型数据间进行运算并输出结果 */ printf("a + c = %d\n", a + c); printf("a + c = %c\n", a + c); printf("f + m = %f\n", f + m); /*...