1 #include<stdio.h> 2 #include<conio.h> 3 #include<stdlib.h> 4 float get_answer()/*定义求结果的函数*/ 5 { 6 float a,b,answer; 7 char flag; 8 scanf("%f%c%f",&a,&flag,&b); 9 switch(flag) 10 { 11 case '+': answer=a+b;break; 12 case '-': answer=a-b;break; 13 case '*': answer=a*b;break; 14 case '/': answer=a/b;break; 15 } 16 return answer; 17 } 18 void main()/*主函数*/ 19 { 20 float b,answer; 21 char flag; 22 int point; 23 system("title 普通计算器"); 24 system("color f0"); 25 printf("输入要保留的小数位:"); 26 scanf("%d",&point); 27 printf("就绪！过程中按“Esc”退出！\n"); 28 answer=get_answer(); 29 printf("=%.*f\n",point,answer); 30 while(1) 31 { 32 flag=getch();/*检测将要执行的命令*/ 33 if(flag==42||flag==43||flag==45||flag==47)/*判断是否是“+，-，*，/”*/ 34 {printf("%c",flag);/*输出运算符*/ 35 scanf("%f",&b); 36 switch(flag) 37 { 38 case '+': answer+=b;break; 39 case '-': answer-=b;break; 40 case '*': answer*=b;break; 41 case '/': answer/=b;break; 42 } 43 printf("%.*f",point,answer);} 44 else if(flag==27)/*按Esc退出*/ 45 break; 46 else/*再次执行运算*/ 47 { 48 printf("\n请输入“a+、-、*、/、b”：\n"); 49 answer=get_answer(); 50 printf("=%.*f\n",point,answer); 51 } 52 } 53 }