#include <stdio.h>

int main(){
  char ch;
  printf("Please Type a char:n");
  scanf("%c",&ch);
  if(ch>='A'&&ch<='Z')
    ch=ch+32;
  printf("%c",ch);

  return 0;
}

#include <stdio.h>

int main(){
  int i, j;
  for(i=1;i<=9;i++){
    for(j=1;j<=i;j++){
      printf("%d%d=%dt",j,i,ij);
    }
    printf("n");
  }
  return 0;
}

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

int main(void){
    float m, i=0, o=0;
    char r='y';

    printf("|--------------|n");
    printf("|--简易计算器--|n");
    printf("|--------------|n");
    printf("|---1.加法-----|n");
    printf("|---2.减法-----|n");
    printf("|---3.乘法-----|n");
    printf("|---4.除法-----|n");
    printf("|---5.退出-----|n");
    printf("|--------------|n");

    while(r=='y'||r=='Y'){
    printf("Please Type Mode(1-4)n");
    scanf("%f",&m);
    printf("Please Type Two Numbersn");
    scanf("%f %f",&i,&o);

        if(m==1) printf("%.2f+%.2f=%.2f",i,o,i+o);
        else if(m==2) printf("%.2f-%.2f=%.2f",i,o,i-o);
        else if(m==3) printf("%.2f%.2f=%.2f",i,o,io);
        else if(m==4) printf("%.2f/%.2f=%.2f",i,o,i/o);

    printf("是否再次运算？y/Y继续，其他字符取消"n");
    r=getch();
    }

    return 0;
}

#int <iostream>

int main(){
  using namespace std;
  cout << "HelloWorld" << endl;

  return 0;
}

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