Randomized ...

[Sunnygirl]

hello @all, i have to write a program which generates randomized letters, e.g. from A to D (variable letters and with a variable length). the string could look like: CString str="AAACCDDDDDBBBBCDABBBDDDD...."; can anybody help me? thank you very much!!! sunny

[David Crow]

char GetRandomLetter( void )
{
char cLetter;

cLetter = (rand() % 26) + 'A';
return cLetter;

}

CString str;
for (int x = 0; x < some_length; x++)
{
char c = GetRandomLetter();
str += c;
}

[valikac]

One solution is to generate a number and then convert it to a char. string text; unsigned int randNum = 0; for (unsigned int i = 0; i < nTextSize; ++i) { randNum = static_cast((((static_cast(rand())) / (static_cast(RAND_MAX + 1))) * 94 + 33)); sName += static_cast(randNum); } Kuphryn

[Sunnygirl]

thanks for reply. the program works, but i don't know why! DavidCrow wrote: cLetter = (rand() % 26) + 'A'; why does this works? thank you very much! :rose::rose::rose: sunny

[David Crow]

rand() gives you a number between 0 and RAND_MAX. Modulo that with 26 gives you a number between 0 and 25. Add 'A' to that gives you one of the 26 letters of the alphabet. Make sense?