Program in C++ to convert string Lowercase into Uppercase

Program in C++ to convert string Lowercase into Uppercase   

#include<iostream>
#include<string.h>
#include<conio.h>
 using namespace std;
    char* StrUpper(char *str)
  {
   int i;
   for(i=0;str[i]!='\0';i++)
     {
      str[i]=str[i]-32;
     }
    return (str);
  }
  int main()
  {
   char str1[100],*str2;
   cout<<"Enter string :-";
   cin.getline(str1,99);
   str2=StrUpper(str1);
   cout<<" Result ="<<str2;
   return 0;
  }

Output:-

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