Convert lowercase letters to uppercase in C++
The function int toupper ( int c ) convert lowercase letter to uppercase. It’s standard build in function in cstring library.
Converts c to its lowercase equivalent if c is an uppercase letter and has a lowercase equivalent. If no such conversion is possible, the value returned is c unchanged.
Example usage of toupper function.
#include <iostream>
#include <cstring>
using namespace std;
int main ()
{
int i; char str[80];
//char * strcpy ( char * container, const char * input );
strcpy(str,"my capital letter sentence.");
for(i=0; str[i]; i++)
str[i] = toupper(str[i]);
cout << str<<endl;
return 0;
}//end of main
Program Output
MY CAPITAL LETTER SENTENCE.
