INTERVIEW QUESTIONS C FUNCTIONS IN C DETAILS

Question: How to see return value of main function?

Answer: //this code will print return value of main
static unsigned int nCount = 0;
void NoReturnFunc();
int main()
{
if(0 == nCount)
NoReturnFunc();

return 0;
}

void NoReturnFunc()
{
nCount++;
int nRetValue = main();
printf("Return by main %d",nRetValue);
getch();
}

//this code will print return value of main
static unsigned int nCount = 0;
void NoReturnFunc();
int main()
{
if(0 == nCount)
NoReturnFunc();

return 0;
}

void NoReturnFunc()
{
nCount++;
int nRetValue = main();
printf("Return by main %d",nRetValue);
getch();
} Source: CoolInterview.com

You can check the return status of any program (executable) by '$?' in the shell

bash# $?

Source: CoolInterview.com

Abstract class contain at least one pure virtual function.
and we cannot create the object of this class....
and virtual function has no body it is terminated by the semicolon and virtual key word is placed behind it.

ex..
virtual int add(int,int)=0; Source: CoolInterview.com

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