Cannot implicitly convert type 'int' to 'bool' ?????

[hellomac23]

Hi im trying to write a if...else for C# but i keep getting Cannot implicitly convert type 'int' to 'bool' i really lost can anybody help me on what that means

[Ganon11]

You are probably using if statements or a loop, in which you try and use an integer to determine the truth value. For instance:

int myFunction(int a, int b) {
   if (a < b) return -1;
   if (a == b) return 0;
   if (a > b) return 1;
}
 
// ...later in your code...
 
if (myFunction(3, 5)) {
   // ...
}
 
// OR
 
while (myFunction(x, 3)) {
   // ...
}

C and C++ allow this, maybe C# doesn't?

[JosAH]

I'm moving this thread over to the .NET forum where the C# questions are posted.

kind regards,

Jos (moderator)

[SvenV]

Please post the piece of code where the exceptiong is thrown

[tlhintoq]

You are probably using if statements or a loop, in which you try and use an integer to determine the truth value. For instance:

int myFunction(int a, int b) {
   if (a < b) return -1;
   if (a == b) return 0;
   if (a > b) return 1;
}
 
// ...later in your code...
 
if (myFunction(3, 5)) {
   // ...
}
 
// OR
 
while (myFunction(x, 3)) {
   // ...
}

C and C++ allow this, maybe C# doesn't?

You're on the right track. In C++ a zero is false, and anything not zero is true.
C# doesn't work that way. You need to actually have boolean responses of true and false.

if (myFunction(3, 5)) {

really says " if (value returned from myFunction(3,5) is true) { ... }"
But your method return an int, not a bool. So the error message complaining "I don't know how to convert your returned int into a bool." makes sense.

You need a boolean as the final evaluation of your if (....) statement.
Try something like this if myFunction will continue to return an int

if (myFunction(3,5) != 0)
{
 // Then do this
}

Otherwise, you can change myFunction to return a bool depending on the conditions.