can Logical operator use in the switch case in the case

[vijay1987]

switch(temp)
{
case (temp<=20):
printf("Hello!");
default:
printf("good old");
}
can i use the case (temp<=20): in the program

[weaknessforcats]

No.

The case has to be a single integer value known to the compiler since the case is compiled in to the object code.

You can try an expression with a compile and you will see the compiler error out on the code.

[donbock]

You could create a new variable to express the various meangful ranges of temp and then switch on that new variable. You may decide this isn't worth the effort. Personally, i would put the case blocks in the if-elseif-else and not have a switch at all.

enum { LE20, GT20_LE40, GT40 } tempRange;
 
if (temp <= 20)
   tempRange = LE20;
else if (temp <= 40)
    tempRange = GT20_LE40;
else
    tempRange = GT40;
 
switch (tempRange) {
    case LE20:
...