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1. while Loop<\/strong><\/h4>\nA while loop is used to execute a statement or group of statements repeatedly so long as a given condition remains true.<\/p>\n
The syntax is:<\/p>\n
while(condition) {\r\n statement(s);\r\n}\r\n<\/pre>\nThe flow diagram for the while loop is shown below:<\/p>\n
![\"While](\"https:\/\/www.kindsonthegenius.com\/cplusplus\/wp-content\/uploads\/sites\/17\/2020\/08\/While-Loop-250x300.jpg\")
<\/a><\/p>\nThe code below is an example of the while loop.<\/p>\n
int<\/span> main<\/span> () {\r\n int<\/span> x =<\/span> 0<\/span>;\r\n\r\n \/\/ while loop<\/span>\r\n while<\/span>( x <<\/span> 10<\/span> ) {\r\n\t \/\/Statement<\/span>\r\n cout <<<\/span> \"x = \"<\/span> <<<\/span> x <<<\/span> endl;\r\n x++<\/span>;\r\n } \r\n return<\/span> 0<\/span>;\r\n}\r\n<\/pre>\nIf you run the above code,\u00a0 you’ll have the output:<\/p>\n
x = 0\r\nx = 1\r\nx = 2\r\nx = 3\r\nx = 4\r\nx = 5\r\nx = 6\r\nx = 7\r\nx = 8\r\nx = 9\r\n<\/pre>\n <\/p>\n
2. for Loop<\/strong><\/h4>\nIn the case of a for loop, the\u00a0 statements are executed a specific number of times. So, the number times the loop with iterate is specified. The basic syntax of the for loop is:<\/p>\n
for ( init; condition; increment ) {\r\n statements;\r\n}\r\n<\/pre>\n\n- init<\/strong> is the loop variable<\/li>\n
- condition<\/strong> is the conditional statement to the checked each time. Normally\u00a0 the check is if the loop variable have reached certain threshold<\/li>\n
- increment<\/strong> is by what step to increase the loop variable after each iteration.<\/li>\n<\/ul>\n
The flow diagram for the for loop is given below:<\/p>\n
![\"For](\"https:\/\/www.kindsonthegenius.com\/cplusplus\/wp-content\/uploads\/sites\/17\/2020\/08\/For-Loop-217x300.jpg\")
<\/a><\/p>\nThe code below illustrates the for loop<\/p>\n
int<\/span> main<\/span> () {\r\n \/\/ for loop<\/span>\r\n for<\/span>( int<\/span> x =<\/span> 1<\/span>; x <<\/span> 10<\/span>; x =<\/span> x +<\/span> 1<\/span> ) {\r\n cout <<<\/span> \"value of x is \"<\/span> <<<\/span> x <<<\/span> endl;\r\n }\r\n \r\n return<\/span> 0<\/span>;\r\n}\r\n<\/pre>\nWhen code execute, x is displayed 10 times as well<\/p>\n
Note that in the for loop, the loop variable is declared and initialized inside the for statement.<\/p>\n
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3. do..while Loop<\/strong><\/h4>\nSimilar to the while loop, the do…while loop executes statements a number of times. However, unlike the while loop, the condition is tested at the end of the loop. Therefore, this loop is guaranteed to execute at least, once.<\/p>\n
Basic syntax for the do..while loop is:<\/p>\n
do {\r\n statement;\r\n} \r\nwhile( condition );\r\n<\/pre>\nThe flow diagram is shown below:<\/p>\n
The flow diagram for the while loop is shown below:<\/p>\n
The code below is an example of the while loop.<\/p>\n If you run the above code,\u00a0 you’ll have the output:<\/p>\n <\/p>\n In the case of a for loop, the\u00a0 statements are executed a specific number of times. So, the number times the loop with iterate is specified. The basic syntax of the for loop is:<\/p>\n The flow diagram for the for loop is given below:<\/p>\n The code below illustrates the for loop<\/p>\n When code execute, x is displayed 10 times as well<\/p>\n Note that in the for loop, the loop variable is declared and initialized inside the for statement.<\/p>\n <\/p>\n Similar to the while loop, the do…while loop executes statements a number of times. However, unlike the while loop, the condition is tested at the end of the loop. Therefore, this loop is guaranteed to execute at least, once.<\/p>\n Basic syntax for the do..while loop is:<\/p>\n The flow diagram is shown below:<\/p>\n<\/a><\/p>\nint<\/span> main<\/span> () {\r\n int<\/span> x =<\/span> 0<\/span>;\r\n\r\n \/\/ while loop<\/span>\r\n while<\/span>( x <<\/span> 10<\/span> ) {\r\n\t \/\/Statement<\/span>\r\n cout <<<\/span> \"x = \"<\/span> <<<\/span> x <<<\/span> endl;\r\n x++<\/span>;\r\n } \r\n return<\/span> 0<\/span>;\r\n}\r\n<\/pre>\nx = 0\r\nx = 1\r\nx = 2\r\nx = 3\r\nx = 4\r\nx = 5\r\nx = 6\r\nx = 7\r\nx = 8\r\nx = 9\r\n<\/pre>\n
2. for Loop<\/strong><\/h4>\n
for ( init; condition; increment ) {\r\n statements;\r\n}\r\n<\/pre>\n\n
<\/a><\/p>\nint<\/span> main<\/span> () {\r\n \/\/ for loop<\/span>\r\n for<\/span>( int<\/span> x =<\/span> 1<\/span>; x <<\/span> 10<\/span>; x =<\/span> x +<\/span> 1<\/span> ) {\r\n cout <<<\/span> \"value of x is \"<\/span> <<<\/span> x <<<\/span> endl;\r\n }\r\n \r\n return<\/span> 0<\/span>;\r\n}\r\n<\/pre>\n3. do..while Loop<\/strong><\/h4>\n
do {\r\n statement;\r\n} \r\nwhile( condition );\r\n<\/pre>\n
![\"Do](\"https:\/\/www.kindsonthegenius.com\/cplusplus\/wp-content\/uploads\/sites\/17\/2020\/08\/Do-While-Loop-241x300.jpg\")
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