Loop the string to mark the vowels which are present
for ( int i = 0 ; i < str . length ( ) ; i ++ ) { if ( str [ i ] == ' A ' str [ i ] == ' a ' ) hash [ 0 ] = 1 ; else if ( str [ i ] == ' E ' str [ i ] == ' e ' ) hash [ 1 ] = 1 ; else if ( str [ i ] == ' I ' str [ i ] == ' i ' ) hash [ 2 ] = 1 ; else if ( str [ i ] == ' O ' str [ i ] == ' o ' ) hash [ 3 ] = 1 ; else if ( str [ i ] == ' U ' str [ i ] == ' u ' ) hash [ 4 ] = 1 ; }