Question

Use C language

fist one to check if is lowercase，and second one to conver it to uppercase.

Use ASCII table.

boolean islowcase(char n)

void strupper(char c)

Answer 1

#include<stdio.h>
#include<stdlib.h>
#include <stdbool.h>
bool islowcase(char n)
{
   if(n>=97 && n<=122)
   return true;
   else
   return false;
}

void strupper(char c){
   if(islowcase(c)){
       c=c-32;
   }
   printf("%c",c);
}
int main(){
   char c='a';
   char d='D';
   strupper(c);
   strupper(d);
}