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Loop structures: Difference between revisions
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// Don't forget to change the value of condition.
// If it remains nonzero, we'll have an infinite loop.
}
}
===do-while===
int main (int argc, char ** argv) {
int condition = ...;
do {
// Do something
// The difference with the first loop is that the
// code in the loop will be executed at least once,
// even if the condition is 0 at the beginning,
// because it is only checked at the end.
// Don't forget to change the value of condition.
// If it remains nonzero, we'll have an infinite loop.
} while ( condition );
}
===for===
int main (int argc, char ** argv) {
int i;
for {i=0; i<10; ++i) {
// The code here will be performed 10 times.
// The first part in the for-statement (i=0) is the initialization,
// and is executed once before the loop begins.
// The second part is the end condition (i<10), which is checked
// every time the loop is started, also the first time;
// the loop ends if it is false.
// The third part (++i) is performed every time the code in the loop
// is at the end, just before the end condition is checked.
}
}
===while with continue===
The continue statement allows you to continue execution
at the beginning of the loop, skipping the rest of the loop.
In C you can only do this with the most inner loop.
You can also do this with do-while and for.
int main (int argc, char ** argv) {
int condition = 1;
while ( condition ) {
// Do something
if (other condition)
continue; // Continue at the beginning of the loop
// Do something else
// This part is not executed if other condition was true
}
}
===while with break===
The break statement allows you to stop a loop.
In C you can only break from most inner loop.
You can also do this with do-while and for.
int main (int argc, char ** argv) {
int condition = 1;
while ( condition ) {
// Do something
if (other condition)
break; // Continue after the the loop
// Do something else
// This part is not executed if other condition was true
}
}
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