switch

[shireesh]

can any one help me
to print students grade using switch in 'c'
if(marks>80)then print very good
if(60<marks<80) good ......
how can i write the code using switch,where can i specify the condition

[Banfa]

You can't, switches do not do that sort of comparison they can only perform the == comparison so unless you can reduce your problem to the point where you only require == you can't use a switch.

[sanketbarot]

As Banfa told you switch is used only for == operation.

But if you want to use only switch then you have to write all the condition. which will be tooooo long.
like........

switch (i)
{

case 60:
case 61:
|
|
|
case 80: (follow this condition)
break:
case 81:
|
|
case 100: (follow this condition)
break;
default:
(follow this conditoin)

[r035198x]

As Banfa told you switch is used only for == operation.

But if you want to use only switch then you have to write all the condition. which will be tooooo long.
like........

switch (i)
{

case 60:
case 61:
|
|
|
case 80: (follow this condition)
break:
case 81:
|
|
case 100: (follow this condition)
break;
default:
(follow this conditoin)

you could still use the switch by transforming a bit

int a;
if 0 < grade 50 a = 1
else if 50 < grade < 70 a = 2
else if etc

then
switch(a) etc

[D_C]

Where are the divisions? Are they all equally spaced?

Suppose A = 90-100, B = 80-89, C = 70-79, D=60-69,F < 60

static const int GRADE_RANGE = 10;
if((grade >= 0) && (grade <= 100))
{
  grade /= GRADE_RANGE;
  switch(grade)
  {
   case 10:
    case 9:  cout << "A" << endl;
             break;
    case 8:  cout << "B" << endl;
             break;
    case 7:  cout << "C" << endl;
             break;
    case 6:  cout << "D" << endl;
             break;
   default:  cout << "F" << endl;
             break;
  }
}

[r035198x]

Where are the divisions? Are they all equally spaced?

Suppose A = 90-100, B = 80-89, C = 70-79, D=60-69,F < 60

static const int GRADE_RANGE = 10;
if((grade >= 0) && (grade <= 100))
{
  grade /= GRADE_RANGE;
  switch(grade)
  {
   case 10:
    case 9:  cout << "A" << endl;
             break;
    case 8:  cout << "B" << endl;
             break;
    case 7:  cout << "C" << endl;
             break;
    case 6:  cout << "D" << endl;
             break;
   default:  cout << "F" << endl;
             break;
  }
}

Wouldn't work for uneven ranges but that's a neater way of doing it

[Banfa]

Personally in this case I would favour an

if (...)
else if (...)
else

construct

[shireesh]

Personally in this case I would favour an

if (...)
else if (...)
else

construct

thnak u very much for ur guidance,iam new to c programmingand a student,i was not expecting reply,but ur replies really encourageed me a lot,once again thank u very much to all of u.