#include <stdio.h>
#include <string.h>
int main( ) {
int i, n = 100 ;
char a[ 100 ] ;
for ( int i = 0 ; i < n; i++ ) {
if ( a[ i] >= 65 && a[ i] <= 90 ) {
a[ i] += 32 ;
}
else if ( a[ i] >= 97 && a[ i] <= 122 ) {
a[ i] -= 32 ;
}
}
printf ( "Chuoi sau khi chuyen la: %s" , a
) ; }
I2luY2x1ZGUgPHN0ZGlvLmg+CiNpbmNsdWRlIDxzdHJpbmcuaD4KCmludCBtYWluKCl7CiAgICBpbnQgaSwgbiA9IDEwMDsKICAgIGNoYXIgYVsxMDBdOwogICAgcHJpbnRmKCJOaGFwIHZhbyBjaHVvaTogIik7CiAgICBnZXRzKGEpOwoKICAgIGZvcihpbnQgaSA9IDA7IGkgPCBuOyBpKyspewogICAgICAgIGlmKGFbaV0gPj0gNjUgJiYgYVtpXSA8PSA5MCl7CiAgICAgICAgICAgIGFbaV0gKz0gMzI7CiAgICAgICAgfQogICAgICAgIGVsc2UgaWYoYVtpXSA+PSA5NyAmJiBhW2ldIDw9IDEyMil7CiAgICAgICAgICAgIGFbaV0gLT0gMzI7CiAgICAgICAgfQogICAgfQogICAgcHJpbnRmKCJDaHVvaSBzYXUga2hpIGNodXllbiBsYTogJXMiLCBhKTsKfQ==