cplusplus:repetition_examples
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cplusplus:repetition_examples [2019/02/11 17:42] – [Sentinel-controlled repetition] mithat | cplusplus:repetition_examples [2019/02/14 21:28] (current) – [Running total] mithat | ||
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====== Control Structures: Repetition examples ====== | ====== Control Structures: Repetition examples ====== | ||
- | ===== while ===== | + | ===== The while statement |
<file c++ simple_while.cpp>// | <file c++ simple_while.cpp>// | ||
Line 34: | Line 34: | ||
cout << num << endl; | cout << num << endl; | ||
num++; | num++; | ||
- | cout << num << endl; | ||
return 0; | return 0; | ||
Line 40: | Line 39: | ||
</ | </ | ||
- | ===== Sentinel-controlled repetition ===== | + | |
+ | ===== Repetition code patterns ===== | ||
+ | |||
+ | ==== Counter-controlled repetition ==== | ||
+ | <file c++ counter-controlled-repetition.cpp>// | ||
+ | #include < | ||
+ | using namespace std; | ||
+ | |||
+ | int main() | ||
+ | { | ||
+ | const int UPPER_LIMIT = 5; | ||
+ | int num = 1; // initialize the counter | ||
+ | |||
+ | while (num <= UPPER_LIMIT) | ||
+ | { | ||
+ | cout << num << endl; | ||
+ | num++; | ||
+ | } | ||
+ | |||
+ | return 0; | ||
+ | }</ | ||
+ | |||
+ | ==== Sentinel-controlled repetition | ||
<file c++ simple-sentinel.cpp> | <file c++ simple-sentinel.cpp> | ||
Line 76: | Line 97: | ||
</ | </ | ||
- | ===== Input validation | + | ==== Input validation ==== |
- | <file c++ simple-input-validation.cpp> | + | <file c++ simple-input-validation.cpp>// |
- | #include < | + | #include < |
- | using namespace std; | + | using namespace std; |
- | | + | int main() |
- | { | + | { |
- | const int LOWER_BOUND = 0; | + | const int LOWER_BOUND = 0; |
- | const int UPPER_BOUND = 100; | + | const int UPPER_BOUND = 100; |
- | int num; | + | int num; |
- | cout << "Enter a number between " << LOWER_BOUND << " and " << UPPER_BOUND << ": "; | + | cout << "Enter a number between " << LOWER_BOUND |
+ | | ||
+ | cin >> num; | ||
+ | |||
+ | // Fall through loop only if input is valid. | ||
+ | while (num < LOWER_BOUND || num > UPPER_BOUND) | ||
+ | { | ||
+ | | ||
+ | << " and " << UPPER_BOUND << ": "; | ||
cin >> num; | cin >> num; | ||
+ | } | ||
- | // Pass through loop only if input is valid. | + | |
- | while (num < LOWER_BOUND || num > UPPER_BOUND) | + | |
- | { | + | |
- | | + | |
- | cin >> num; | + | |
- | } | + | |
- | cout << " | + | return 0; |
+ | } | ||
- | return | + | </ |
+ | |||
+ | ==== Running total ==== | ||
+ | <file c++ simple-running-total.cpp>// | ||
+ | // Total all the integers between a lower and an upper bound. | ||
+ | #include < | ||
+ | using namespace std; | ||
+ | |||
+ | int main() | ||
+ | { | ||
+ | const int LOWER_BOUND = 0; | ||
+ | const int UPPER_BOUND = 10; | ||
+ | |||
+ | int num = LOWER_BOUND; | ||
+ | int sum = 0; // accumulator | ||
+ | |||
+ | while (num <= UPPER_BOUND) | ||
+ | { | ||
+ | sum += num; // add the new value to the accumulator | ||
+ | num++; | ||
} | } | ||
+ | |||
+ | cout << "The sum of integers from " << LOWER_BOUND | ||
+ | << | ||
+ | << | ||
+ | |||
+ | return 0; | ||
+ | } | ||
+ | |||
</ | </ | ||
- | ===== for ===== | + | |
+ | ===== The for statement | ||
<file c++ simple-for.cpp>// | <file c++ simple-for.cpp>// | ||
#include < | #include < |
cplusplus/repetition_examples.1549906947.txt.gz · Last modified: 2019/02/11 17:42 by mithat