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.