COUNTING LOOPS AND ACCUMULATORS
COUNTING LOOPS AND ACCUMULATORS
Two very important looping idioms are counting loops and accumulators.
A counting loop uses a variable, called the loop control variable, to keep count of how many cycles it's been through. To fashion such a loop:
1. Think up a short, easy name for your loop control variable. 2. Before the loop begins, declare the loop control variable and initialize it to zero. 3. During each loop cycle, increment the loop control variable.
Example This code fragment illustrates a loop that cycles once for each value of k from 0, 1, 2, etc. k is the loop control variable.
int k = 0; while ( . . . ) {
. . . k++; }
A definite counting loop cycles a definite number of times. Such a loop must stop when the loop control variable reaches the desired number of cycles.
Examples Each of these definite counting loops cycles n times.
int k = 0; while ( k < n ) {
. . . k++; }
int k = 1; while ( k ................
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