I have this warning.
warning : 'return' with no value, in function returning non-void.
25 Answers
You have something like:
int function(void) { return; } Add a return value, or change the return type to void.
The error message is very clear:
warning : 'return' with no value, in function returning non-void.
A return with no value is similar to what I showed. The message also tells you that if the function returns 'void', it would not give the warning. But because the function is supposed to return a value but your 'return' statement didn't, you have a problem.
This is often indicative of ancient code. In the days before the C89 standard, compilers did not necessarily support 'void'. The accepted style was then:
function_not_returning_an_explicit_value(i) char *i; { ... if (...something...) return; } Technically, the function returns an int, but no value was expected. This style of code elicits the warning you got - and C99 officially outlaws it, but compilers continue to accept it for reasons of backwards compatibility.
This warning also happens if you forget to add a return statement as the last statement:
int func(){} If you don't specify the return type of a function it defaults to int not to void so these are also errors:
func(){} func(){ return; } If you really do not need to return a value you should declare your function as returning void:
void func(){} void func(){ return; } This warning happens when you do this:
int t() { return; } Because t() is declared to return an int, but the return statement isn't returning an int. The correct version is:
int t() { return 0; } Obviously your code is more complicated, but it should be fairly easy to spot a bare return in your code.
while making a new class declare a class as void i.g.
void sum(int a, int b) { //function } Whenever you are not declaring any function with void(null) return value,
void examPle(){//Function block with no return type } , you should always specify a valid return type you expext as the o/p. Below is the basic syntax of what you should be returning when writing your main block.
int main(){ return 0; } here return 0; means success.
