C语言编写长度转换代码时出现了问题

问题：在编写长度转换的代码时，自己编写的菜单出现了问题提示
代码：

#include 
#include 
#include 
#include 

void LengthMenu() {       //排序子菜单

    printf("****************************************\n");
    printf("*\t\t1.英寸转化\t\t*\n");
    printf("*\t\t2.英尺转化 \t\t*\n");
    printf("*\t\t3.毫米转化 \t\t*\n");
    printf("*\t\t4.厘米转化 \t\t*\n");
    printf("*\t\t5.分米转化 \t\t*\n");
    printf("*\t\t6.米转化 \t\t*\n");
    printf("*****************************************\n");
}

void Lenhgth()
{
double q,n;
 char in,ft,mm,cm,dm,m;
 char a[6];
 int i;
 printf("请输入要算的数：\n");
 scanf("%lf",&q);
 printf("请输入您的选择：\n");
 scanf("%d",&i);

 switch(i)
 {
  case 1://in
    printf("输入想要转化成的单位：\n");
    scanf("%s",&a);
    if(strcmp(a,"in")==0) n=q;
    else if(strcmp(a,"ft")==0) n=q*12;
    else if(strcmp(a,"mm")==0) n=q*0.0394;
    else if(strcmp(a,"cm")==0) n=q*0.394;
    else if(strcmp(a,"dm")==0) n=q*3.937;
    else if(strcmp(a,"m")==0)  n=q*39.37;
    printf("%lf in=%lf %s",q,n,a);
    break;
  case 2://ft
    printf("输入想要转化成的单位：\n");
    scanf("%s",&a);
    if(strcmp(a,"in")==0) n=q/12;
    else if(strcmp(a,"ft")==0) n=q;
    else if(strcmp(a,"mm")==0) n=q*0.00328;
    else if(strcmp(a,"cm")==0) n=q*0.0328;
    else if(strcmp(a,"dm")==0)  n=q*0.328;
    else if(strcmp(a,"m")==0)  n=q*3.28;
    printf("%lf ft=%lf %s",q,n,a);
    break;
  case 3://mm
    printf("输入想要转化成的单位：\n");
    scanf("%s",&a);
    if(strcmp(a,"in")==0)  n=q/0.0394;
    else if(strcmp(a,"ft")==0) n=q/0.00328;
    else if(strcmp(a,"mm")==0) n=q;
    else if(strcmp(a,"cm")==0) n=q*10;
    else if(strcmp(a,"dm")==0) n=q*100;
    else if(strcmp(a,"m")==0)  n=q*1000;
    printf("%lf mm=%lf %s",q,n,a);
    break;
  case 4://cm
    printf("输入想要转化成的单位：\n");
    scanf("%s",&a);
    if(strcmp(a,"in")==0)  n=q/0.394;
    else if(strcmp(a,"ft")==0) n=q/0.0328;
    else if(strcmp(a,"mm")==0) n=q/10;
    else if(strcmp(a,"cm")==0) n=q;
    else if(strcmp(a,"dm")==0) n=q*10;
    else if(strcmp(a,"m")==0)  n=q*100;
    printf("%lf cm=%lf %s",q,n,a);
    break;
  case 5://dm
    printf("输入想要转化成的单位：\n");
    scanf("%s",&a);
    if(strcmp(a,"in")==0) n=m/3.937;
    else if(strcmp(a,"ft")==0) n=m/0.328;
    else if(strcmp(a,"mm")==0) n=m/100;
    else if(strcmp(a,"cm")==0) n=m/10;
    else if(strcmp(a,"dm")==0) n=m;
    else if(strcmp(a,"m")==0)  n=m*10;
    printf("%lf dm=%lf %s",m,n,a);
    break;
  case 6://m
    printf("输入想要转化成的单位：\n");
    scanf("%s",&a);
    if(strcmp(a,"in")==0) n=q/39.37;
    else if(strcmp(a,"ft")==0) n=q/3.28;
    else if(strcmp(a,"mm")==0) n=q/1000;
    else if(strcmp(a,"cm")==0) n=q/100;
    else if(strcmp(a,"dm")==0) n=q/10;
    else if(strcmp(a,"m")==0)  n=q;
    printf("%lf m=%lf %s",q,n,a);
    break;
  default:
    printf("输入错误请重新输入");
}

}




int main()
{

LengthMenu();


Lenhgth();



return 0;

}

出现问题的界面：

代码里有中文，.c文件要按utf8格式保存

• 你可以参考下这个问题的回答, 看看是否对你有帮助, 链接: https://ask.csdn.net/questions/7615196