•
•
•
•
What is DaniWeb IT Discussion Community?
You're currently browsing the C++ section within the Software Development category of DaniWeb, a massive community of 427,237 software developers, web developers, Internet marketers, and tech gurus who are all enthusiastic about making contacts, networking, and learning from each other. In fact, there are 2,204 IT professionals currently interacting right now! Registration is free, only takes a minute and lets you enjoy all of the interactive features of the site.
Please support our C++ advertiser: Programming Forums
Views: 2737 | Replies: 8
![]() |
•
•
Join Date: Sep 2004
Location: Overflow State
Posts: 183
Reputation:
Rep Power: 5
Solved Threads: 4
Not declaring a function's return value is an error in C++, whether the function is main or not. In C99, the October 1999 revision to Standard C, not declaring a function's return value is also an error (in the previous version of Standard C an implicit int was assumed as the return value if a function was declared/defined without a return value). But the usual requirement of both Standard C++ and Standard C is that main should be declared to return an int. In other words, this is an acceptable form of main:
The problem is that this code declares main to return a void and that's just no good for a strictly conforming program. Neither is this:
implicit int not allowed in C++ or C99
Hope this helps,
- Stack Overflow
int main(void) { /* ... */ }The problem is that this code declares main to return a void and that's just no good for a strictly conforming program. Neither is this:
implicit int not allowed in C++ or C99
main() { /* ...Whatever... */ }Hope this helps,
- Stack Overflow
Following the rules will ensure you get a prompt answer to your question. If posting code, please include BB [code][/code] tags. Your question may have been asked before, try the search facility.
IRC
Channel: irc.daniweb.com
Room: #c, #shell
IRC
Channel: irc.daniweb.com
Room: #c, #shell
•
•
•
•
Originally Posted by iamboredguy
I don't get why C++ pros see red when they see void main(). Can someone explain why intmain() is good and void main() bad?
In You Program You can Have Program like this
pro 1
void main()
{
/* */
}
pro 2
int main()
{
/* */
return 0;
}
in pro1 its showing you void main it's mean's RETURN NOTHING just a main Function with your code!! but in pro2 its haveing int main() function it's mean's that function return a value!! so if you put in void main function to return a value u will get an Error so best way is you have to use void main function in your program!!
example
#include <stdio.h>
#include <conio.h>
int call(int x,int y);
void main()
{
int num1,num2,ans;
clrscr();
printf("Enter the First number : ");
scanf("%d",&num1);
printf("\nEnter the Secound Number : ");
scanf("%d",&num2);
/*call the cal function using ans */
ans=call(num1,num2);
printf("The Add of num1 and num2 is %d",ans);
getch();
}
int call(int x,int y)
{
int z;
z=(x+y);
return (z); /* cal function go back to main function*/
}
pro 1
void main()
{
/* */
}
pro 2
int main()
{
/* */
return 0;
}
in pro1 its showing you void main it's mean's RETURN NOTHING just a main Function with your code!! but in pro2 its haveing int main() function it's mean's that function return a value!! so if you put in void main function to return a value u will get an Error so best way is you have to use void main function in your program!!
example
#include <stdio.h>
#include <conio.h>
int call(int x,int y);
void main()
{
int num1,num2,ans;
clrscr();
printf("Enter the First number : ");
scanf("%d",&num1);
printf("\nEnter the Secound Number : ");
scanf("%d",&num2);
/*call the cal function using ans */
ans=call(num1,num2);
printf("The Add of num1 and num2 is %d",ans);
getch();
}
int call(int x,int y)
{
int z;
z=(x+y);
return (z); /* cal function go back to main function*/
}
People please! Is this a hosted implementation? Do you excect printf to do anything? Then void main is incorrect. Period.
>Why is it necessary to have void main() in Java?
I'd say it's because Java applications run in a virtual environment, curtosey of the Java VM. So when a program finishes, it doesn't return to the operating system, it in fact returns to the VM. Therefore rules such as
I'd say it's because Java applications run in a virtual environment, curtosey of the Java VM. So when a program finishes, it doesn't return to the operating system, it in fact returns to the VM. Therefore rules such as
int main do not apply. tuxation.com - Linux articles, tutorials, and discussions
![]() |
•
•
•
•
•
•
•
•
DaniWeb C++ Marketplace
•
•
•
•
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Similar Threads
Other Threads in the C++ Forum
- Previous Thread: C++ File Generator
- Next Thread: csv problem



Linear Mode