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scanf problem

I'm having trouble with a scanf portion of code. The program asks for a single character A, B, or C. If the user enters anything other than those three choices, the program is supposed to ask them to reenter the correct character. I used an if statement to check the character entered but the segment of code isn't working right. It prints out the code asking for the new character twice and then goes onto the next segment of code. Here is the portion of code causing the trouble.

printf("Enter the character>");
      scanf("%c", &dcChar);

      dChar = toupper(dChar);

      if ((dChar != 'A') || (dChar != 'B') || (dChar != 'C'))
      {
            printf("Please enter in either an A, B, or C>");
            scanf("%c", &dChar);
      }
Could you tell me what the problem is please?

danielsonchris

//change the following line:
dChar = toupper(dChar);
//TO:
dChar = toupper(dcChar);

//Now remove the OR clauses in the following line:
if ((dChar != 'A') || (dChar != 'B') || (dChar != 'C'))
//TO:
if ((dChar != 'A') && (dChar != 'B') && (dChar != 'C'))

Peace,
Chris

macabra

ASKER

Okay I did the change and the second line is gone but it doesn't wait for me to enter in a new dChar. It goes right to the next line in the program.

avizit

To let you enter a new dChar you have to code the whole thinginto a while loop

something like this logic

int done = 0;

while(!done) {
print - enter a char
if char satisfies
done = 1
}

macabra

ASKER

Okay the loop is working but now the double printf line is back...

avizit

paste your current code here

macabra

ASKER

while(done == 0)
{
if ((dChar != 'A') && (dChar != 'B') && (dChar != 'C'))
{
printf("Please enter a A, B, or C>")
scanf("%c", dChar)
}
else
{
done = 1;
}
}

ASKER CERTIFIED SOLUTION

avizit

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