求c语言简单程序,其中包括加减乘除,结果保留2位小数.答:include <stdio.h> int main(){ float a=0;float b=0;float c=0;float sum=0;printf("请输入两个加数,用逗号分开\n");scanf("%f,%f",&a,&b);sum=a+b;printf("%f+%f=%.2f\n",a,b,sum);printf("请输入减数\n");scanf("%f",&c);printf("%f-%f=%.2f\n",sum,c,sum-c...