Quit from procedure in C

[JaMe]

In a function, "return" will let you quit from a function. What is used if it is in procedure ?

 

[slcoleman]

In the C language all procedures are functions. The closest analogy to a procedure is a function that returns a void type (empty value).

e.g.

void myProcedure()
{
/* do something */
}


If you want to return from a void function you just use "return;" without specifying any return value, since one is not expected by the calling function.

void myProcedure(int aValue)
{
if (aValue < 0)
return;
else
printf("aValue looks good to me: %d\n",aValue);
}

 

[keinstein]

There is no need to write return. void myProcedure(int aValue)
{
if (aValue < 0)
//return; comment out
else
printf("aValue looks good to me: %d\n",aValue);
}
some compilers will actually complain.

 

[Cortex]

You can use "break;" if your function don't return anything

if you use void with a return ! some compiler will generate error

 

[jayavardhan]

In the C language all procedures are functions.
If you use void with a return ! some compiler will generate error.
So no need to write return

 

[scootyty]

Just Use Break command

Example
int a = 0;
for(a = 0; a < 10; a ++)
{
printf("\t%d", a);
if(a == 5)
{break;}
}

The break will exit from the for loop... As for function you just need to put a condition and break it.

 

[Darth Maul]

In C, procedure is a function that returns nothing. You have to declare it as

void MyRoutine() //with or without parameter
{
...some statements...
return;
}

A function that returns nothing will return control to the caller once end of the function is reached (}), or if it encounter early return; statement. break will only exit from a loop statement, e.g.

void MyRoutine(void)
{
int i;

for(i=0; i<=100; i++){
if(i==50)
break;
...some statements...
} // End of loop

...some statements again...
} //End of function

When i reaches 50, control exits from the loop, the statements after the loop will be executed, and then control will be passed back to the caller. So break-ing will not return control to the caller unless it is placed before end of function -- which is no need if it is.

Caution: declaring a function as

MyRoutine(void);

doesn't imply that the function returns nothing, instead, the compiler assumes return type to be of type int. So you MUST declare the return type as void if that is what you meant.