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16 Cards in this Set
- Front
- Back
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"while" loops A _____ is evaluated at beginning of loop. If it evaluates to true, the loop body is executed. If it evaluates to false, control shifts to first statement after loop body. |
Repetition-condition |
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"while" loops _________ contains one or more C statements. After last statement in _______ is executed, control is shifted back to beginning of loop, and is reevaluated. |
body
body |
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"while" loops _______ must be made within the loop. That is, something must be done so that eventually evaluates to false. Otherwise we have an "infinite loop." |
Progress |
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while (<_________>) { <_________> } |
Repetition condition body |
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for(<______> ; <_____> ; <_____>) { <_____> } |
Initialization
Repetition condition Update expression Body |
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"for loop" <___________> statement initializes the loop control variables before loop is executed the first time. |
Initializes
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"for loop" <_________> is tested at beginning of loop. If it is true, loop is executed |
Repetition condition
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"for loop" <_____> contains one or more C statements. After last statement in <_____> is executed, control is shifted back to beginning of loop. Then, is executed. Finally, is reevaluated. |
Body
Body |
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"for" loop As with while loops, the <_____> must define "progress." That is, something must be done so that eventually evaluates to false. Otherwise we have an "infinite loop." |
update-expression
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List three ways to increment a variable by one. |
1. variable = variable+ 1 2. variable++ 3. variable += 1 |
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count = count - increment
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count -= increment |
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product = product * product |
product *= product |
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sum = sum/divisor |
sum /= divisor |
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remainder = remainder % 2 |
remainder %=2 |
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How do you decide when a loop is needed?
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Are any steps repeated? No: No loop required. Yes: Do you know in advance how many steps are repeated? No: Use a conditional loop Yes: Use a counting loop |
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Code in C for a while loop that counts to 50 |
int i = 0; while(i<50); { i++; } |
