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#include <stdio. h> #include <stdlib. h>//定义杂项函数及内存分配函数 int main(){//表示有返回值 float a; float b; char ch; printf("请输入你需要的计算方式\n"); scanf("%c",&ch); printf("请输入第一个数\n"); scanf("%f",&a); printf("请输入第二个数\n"); scanf("%f",&b); switch(ch){//处理多分支结构的条件选择语句 case '+'://选择 printf("加法的结果是%f\n",a+b); break;//退出switch语句 case '-': printf("减法的结果是%f\n",a-b); break; case '': printf("乘法的结果是%f\n",ab); break; case '/': printf("除法的结果是%f\n",a/b); break; case '%': printf("求模的结果是%f\n",a%b); break; } return 0;//程序退出 }