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#include < stdio.h >
main()
{
float a=1;
switch(a)
{
case 1:
printf("%f",a);
break;
case 1.0:
printf("%f",a);
break;
default:
printf("%f",a);
}
return 0;
}

Output

Compilation Error:
Switch Selection expression must be integral type.
Constant expression required

Logic:

Switch Selection expression must be integral type:

we can give only integer or characters variable to switch case.

Constant expression required:

we can use only integer constants or characters in case.

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