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void main( int argc, char* argv[]) {
for ( int i = 
0; i < argc; i++ ) {
if ( ! isalpha(argv[0]) ) {
cout << "Not a letter";
} else {
cout << "A letter";
}
}
}

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  2. if¿Í else ÆÄÆ®¸¦ ÀüȯÇϽʽÿÀ.

void main( int argc, char* argv[]) {
for ( int i = 
0; i < argc; i++ ) {
if ( isalpha(argv[0]) ) {
cout << "A letter";
} else {
cout << "Not a letter";
}
}
}