Explain break statement in a loop ?
A break statement exits a loop before an entry condition fails. For instance, in this variation on the CountWheat program an error message is printed, and you break out of the for loop if j becomes negative.
class CountWheat {
public static void main (String args[]) {
int total = 0;
for (int square=1, grains = 1; square <= 64; square++) {
grains *= 2;
if (grains <= 0) {
System.out.println("Error: Overflow");
break;
}
total += grains;
System.out.print(total + "\t ");
if (square % 4 == 0) System.out.println();
}
System.out.println("All done!");
}
}
Here's the output:
% javac CountWheat.java
% java CountWheat
2 6 14 30
62 126 254 510
1022 2046 4094 8190
16382 32766 65534 131070
262142 524286 1048574 2097150
4194302 8388606 16777214 33554430
67108862 134217726 268435454 536870910
1073741822 2147483646 Error: Overflow
All done!
The most general use of break is in switch statements.