help with understanding ascii chart

hi i want to loop while a users input is not a lower case character and i was wondering how i could do this ,i tries using the ascii chart but its not working.what exactly am i doing wrong?

Code:

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if (x < 97 || x > 122)
            {
                printf("invalid input\nplease input a lower chase character");
                }

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That check is correct. Your error must be elsewhere - how are you obtaining the input characters? Please show more of the code.

i input using the scanf function

Code:

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getchar();
 printf("\n YOU GUESS : ");
 scanf("%c",&guess);

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guess = x btw

Quote:

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Originally Posted by africanwizz

i input using the scanf function

Code:

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getchar();
 printf("\n YOU GUESS : ");
 scanf("%c",&guess);

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Same old problem. Add one space before the %c, so newline chars left in the keyboard buffer, (input stream in this case), will be passed over.

it still doesnt work

Quote:

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Originally Posted by africanwizz

it still doesnt work

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You need to add some more logic to get the kind of user input you want.

Consider:

Code:

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pseudo code
ok is an int.
do  //start of do while loop

  ok=1;    //set a logic switch assume input will be ok
  get x from the user
  if(x <'a' || x >'z') {  //what you have but clearer
        printf("invalid input\nplease input a lower chase character\n");
        ok=0; //set logic switch to not ok
  }
while(!ok);

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Try something like that.

thanks ,that worked

Quote:

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Originally Posted by africanwizz

thanks ,that worked

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You can also write

if (!islower(x))
// ... foo ...

This function and others like it are in the header file ctype.h and they are guaranteed to work even if you port to a system that doesn't use ascii.

thanks,ill be sure to try that out!