你這樣寫肯定不行啦

有没有生硬在于你的界面怎么设计。

乱七八糟，用一个常量case，没有printf的输出格式！楼主估计已经头大了。

case 后面就不能跟双引号所代表的字符串

嗯，是这样的。

如果你一定要使用case的话  可以尝试变通解决

比如 使用 小于号< 代表左位移  使用大于号> 代表右位移 等等  总之 case 后只能跟单字符

/*

感谢各位，已经实现了这个子程序。*/

#include <stdio.h>
#include <math.h>

void Bit_operation()
{
     int a,b;
     int d = 0;
     int n;
     printf("  1：与运算     2：或运算     3：按位与或   4：求反操作  \n");
     printf("  5：左移操作   6：右移操作   7：Exit\n");
     printf("请输入你的选择");
     scanf("%d",&n);
     printf("\n");
     switch(n){
                case 1:
                     printf("请输入你要运算的第一个数的值:");
                     scanf("%d",&a);
                     printf("\n");
                     printf("请输入你要运算的第二个数的值:");
                     scanf("%d",&b);
                     d = a&b;      
                     printf("运算结果为：%d\n",d);break;
                case 2:
                     printf("请输入你要运算的第一个数的值:");
                     scanf("%d",&a);
                     printf("\n");
                     printf("请输入你要运算的第二个数的值:");
                     scanf("%d",&b);
                     d = a|b;
                     printf("运算结果为：%d\n",d);break;  
                case 3:
                     printf("请输入你要运算的第一个数的值:");
                     scanf("%d",&a);
                     printf("\n");
                     printf("请输入你要运算的第二个数的值:");
                     scanf("%d",&b);
                     d = a^b;
                     printf("运算结果为：%d\n",d);break;
                case 4:
                     printf("请输入你要运算的数值:");
                     scanf("%d",&a);
                     printf("\n");
                     d = ~a;
                     printf("运算结果为：%d\n",d);break;
                case 5:
                     printf("请输入你要运算的数值:");
                     scanf("%d",&a);
                     printf("请确认你要左移的位数:");
                     scanf("%d",&n);
                     d = a<<n;
                     printf("运算结果为：%d\n",d);break;
                case 6:
                     printf("请输入你要运算的数值:");
                     scanf("%d",&a);
                     printf("请确认你要左移的位数:");
                     scanf("%d",&n);
                     d = a>>n;
                     printf("运算结果为：%d\n",d);break;      
                default:
                     printf("您的输入有误，请重新输入！");
                }
}
main()
{
      char c;
      int a,b;
      int n;
      printf("欢迎来到运算小世界！！！\n");
      printf("\n");
      Bit_operation(a,b,n);
      system("pause");
      
}