c语言编译时出现一段中文错误

Question

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

//公顷hm²,亩Mu,平方米m²，平方厘米cm²
void AreaMenu() {      

    printf("****************************************\n");
    printf("*\t\t1.公顷转化\t\t*\n");
    printf("*\t\t2.亩转化 \t\t*\n");
    printf("*\t\t3.平方米转化 \t\t*\n");
    printf("*\t\t4.平方厘米转化 \t\t*\n");
    printf("*****************************************\n");
}


int main()
{
   AreaMenu();

  double m,n;
  char hm2,Mu,m2,cm2;
  char a[4];
  int i;
  printf("请输入要算的数：");
  scanf("%lf",&m);
  printf("请输入您的选择：");
  scanf("%lf",&i);

  switch(i)
  {
    case 1://hm²
       printf("输入您想要转化成的单位: ");
       scanf("%s",&a);
       if(strcmp(a,"hm2")==0) n=m;
       else if(strcmp(a,"Mu")==0) n=m*0.067;
       else if(strcmp(a,"m2")==0) n=m*0.0001;
       else if(strcmp(a,"cm2")==0) n=m*0.00000001;
       printf("%lf in=%lf %s",m,n,a);
       break;
    case 2://Mu
       printf("输入您想要转化成的单位: ");
       scanf("%s",&a);
       if(strcmp(a,"hm2")==0) n=m*15;
       else if(strcmp(a,"Mu")==0) n=m;
       else if(strcmp(a,"m2")==0) n=m*0.0015;
       else if(strcmp(a,"cm2")==0) n=m*0.00000015;
       printf("%lf in=%lf %s",m,n,a);
       break;
    case 3://m²
       printf("输入您想要转化成的单位: ");
       scanf("%s",&a);
       if(strcmp(a,"hm2")==0) n=m*10000;
       else if(strcmp(a,"Mu")==0) n=m*666.67;
       else if(strcmp(a,"m2")==0) n=m;
       else if(strcmp(a,"cm2")==0) n=m*0.0001;
       printf("%lf in=%lf %s",m,n,a);
       break;
    case 4://cm²
       printf("输入您想要转化成的单位: ");
       scanf("%s",&a);
       if(strcmp(a,"hm2")==0) n=m*100000000;
       else if(strcmp(a,"Mu")==0) n=m*6670000;
       else if(strcmp(a,"m2")==0) n=m*10000;
       else if(strcmp(a,"cm2")==0) n=m;
       printf("%lf in=%lf %s",m,n,a);
       break;
    default:
    printf("输入错误请重新输入");


  }


    return 0;
}

Answer 1

典型的编码不一致
把.c文件按utf8格式保存