0
Labels are used to label the statements that follow for use with goto statements. Labels are user-defined names that follow standard naming conventions, starting in column 1 and ending with a colon (:). They are usually placed on a line of their own but must appear in the same function that contains the goto. Note that a label that has no statements following (the label is the last statement in the function), it must include a semi-colon (;) after the colon (an empty statement).
Although many programmers frown upon the use of goto, it is really no different to using return, break or continue to interrupt the normal program flow within a function. However, it's fair to say goto statements are often used quite inappropriately, producing "spaghetti code" that is really quite difficult to follow.
In many cases there will be a better alternative to using a goto, however the following example illustrates a correct usage for goto, breaking out of nested compound statements. The functions UseBreak() and UseGoto() both produce exactly the same results, but the goto version is easier to follow as the conditional expression only needs to be evaluated once. Evaluating one goto rather than two breaks is also more efficient.
#include <iostream>
using namespace std;
void UseBreak()
{
cout<<"UseBreak() executing..."<<endl;
int i, j;
for(i=0;i<10;++i)
{
cout<<"Outer loop executing. i="<<i<<endl;
for(j=0;j<2;j++)
{
cout<<"\tInner loop executing. j="<<j<<endl;
if(i==3)
break; // break out of inner loop.
}
if(i==3)
break; // break out of outer loop.
cout<<"\tInner loop finished."<<endl;
}
cout<<"Outer loop finished."<<endl<<endl;
}
void UseGoto()
{
cout<<"UseGoto() executing..."<<endl;
int i, j;
for(i=0;i<10;++i)
{
cout<<"Outer loop executing. i="<<i<<endl;
for(j=0;j<2;j++)
{
cout<<"\tInner loop executing. j="<<j<<endl;
if(i==3)
goto stop; // jump out of both loops.
}
cout<<"\tInner loop finished."<<endl;
}
stop:
cout<<"Outer loop finished."<<endl<<endl;
}
int main()
{
UseBreak();
UseGoto();
return(0);
}
Output:
UseBreak() executing...
Outer loop executing. i=0
Inner loop executing. j=0
Inner loop executing. j=1
Inner loop finished.
Outer loop executing. i=1
Inner loop executing. j=0
Inner loop executing. j=1
Inner loop finished.
Outer loop executing. i=2
Inner loop executing. j=0
Inner loop executing. j=1
Inner loop finished.
Outer loop executing. i=3
Inner loop executing. j=0
Outer loop finished.
UseGoto() executing...
Outer loop executing. i=0
Inner loop executing. j=0
Inner loop executing. j=1
Inner loop finished.
Outer loop executing. i=1
Inner loop executing. j=0
Inner loop executing. j=1
Inner loop finished.
Outer loop executing. i=2
Inner loop executing. j=0
Inner loop executing. j=1
Inner loop finished.
Outer loop executing. i=3
Inner loop executing. j=0
Outer loop finished.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
What do the initials CBF and CPP stand for?
CPP
When was CPP Group created?
CPP Group was created in 1980.
What is CPP Studios Event GmbH's population?
The population of CPP Studios Event GmbH is 30.
When was CPP Studios Event GmbH created?
CPP Studios Event GmbH was created in 1983.
CPP Program for Implementing Knuth-morris-pratt pattern matching algorithm?
what is the pure algorithm instead of cpp program?
How can you distinguish between Cast Poly Propylene CPP film and Low density poly ethylene LDPE film?
best and simple way is to seal the Film with any LDPE & CPP film and compare the seal strength result, similar polymer will give the better seal strength.
When did CPP start?
I believe it was in 1967
What is a shorted CPP switch?
Bu11sh1+
How the c and cpp extension files can be retrived using FIND command in Linux?
find . -iname '*.c' -o -iname '*.cpp'
What is the history of cpp-npa-ndf?
Later then we know that ninoy aquino has been a big part in the creation of cpp/npa/ndf.
What is the difference between bopp and cpp film?
CPP film is a plastic extrusion made of polypropylene. BOPP films are bi-directional polypropylene. CPP film is high gloss, has good transparency, is heat resistant, and water resistant.
Can you receive cpp benefits before age 60?
Canada Pension Plan (CPP). No not unless you are disabled. Click on the below Related Link
