Stuck......help greatly appreciated.

Hey Guys,

So I have to write a program, using the switch statement, that allows a user to enter a percentage mark, and output the corresponding letter grade. This is what I've come up with so far. It compiles, but whenever a number is entered the program quits......

Am i not returning properly?

Any help would be greatly appreciated. Thanks in advance. Cheers.

Code:

#include <stdio.h>


int main()
{
int num_grade, tens;

  printf("Enter numerical grade:");
  scanf("%d", &num_grade);

  if ((num_grade < 0) || (num_grade > 100)) {
    printf("Grade must be positive AND less than 100.\n");
  }
  else {
    tens = num_grade / 10;
    switch (tens) {
      case 0: printf("The grade is F.\n");
              break;

      case 1:printf("The grade is F.\n");
              break;

      case 2:printf("The grade is F.\n");
              break;

      case 3:printf("The grade is F.\n");
              break;

      case 4:printf("The grade is F.\n");
              break;

      case 5: printf("The grade is F.\n");
              break;

      case 6: printf("The grade is D.\n");
              break;

      case 7: printf("The grade is C.\n");
              break;

      case 8: printf("The grade is B.\n");
              break;

      case 9:  printf("The grade is A.\n");
              break;

      case 10: printf("The grade is A.\n");
              break;

    }
  }

  return 0;
}

It's probably not a problem with the code, but instead this. Cprogramming.com FAQ > Stop my Windows Console from disappearing everytime I run my program?

Also, in switch statements you can do this:

Code:

switch( variable ) {
case 1:
case 2:
case 3: // Will execute if variable is 1 or 2 or 3
  // code...
  break;

// etc
}

Also, it might make more sense to do it with if-else trees rather than a switch, as you can specify grade ranges easily enough.

The program may be quitting, just because it's done.

Add this just before the return 0 line of code:

Code:

printf("\n\n\t\t\t     press enter when ready");
tens = getchar();

I use that for nearly all my programs because I have an old and a new compiler, and only the new one, holds the text (console), window open, after the program is done.

The old one (Turbo C/C++), closes the window, immediately. If I don't hold the window open, I can't read the monitor before it's quit.

Hey thanks for the reply, i'll take a look into that!

You're welcome!

Finally got it, yeah it wasn't ending correctly, or should I say I wasn't making it end the way I wanted :P Thanks everyone for their help!