if condition:\r\n # Code to execute if condition is true<\/code><\/pre>\n2) if-else statement:<\/i><\/b> This statement allows you to execute different blocks of code based on whether a condition is true<\/i><\/b> or false<\/i><\/b>. The syntax is:<\/p>\nif condition:\r\n # Code to execute if condition is true\r\nelse:\r\n # Code to execute if condition is false<\/code><\/pre>\n\t\t\n\t\t\t \n \n \n \n \n \n \t\t\n\t\t\t\t\n\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t <\/div>\n <\/div>\n <\/div>\n <\/section>\n \t\t<\/div>\n\t\t<\/div>\n<\/div>\n3) if-elif-else statement:<\/i><\/b> This statement allows you to handle multiple conditions. The syntax is:<\/p>\nif condition1:\r\n # Code to execute if condition1 is true\r\nelif condition2:\r\n # Code to execute if condition2 is true\r\nelse:\r\n # Code to execute if none of the conditions are true<\/code><\/pre>\nExample:<\/p>\n
age = 18<\/code><\/pre>\nif age >= 18:\r\n print(\"You are old enough to vote.\")\r\nelse:\r\n print(\"You are not old enough to vote.\")<\/code><\/pre>\n#common mistake to avoide errors<\/code><\/pre>\n# Incorrect\r\nif age >= 18\r\n print(\"You are old enough to vote.\")<\/code><\/pre>\n# Corrected\r\nif age >= 18:\r\n print(\"You are old enough to vote.\")<\/code><\/pre>\n![\"\"](\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/01\/loop-statements.png\")
<\/p>\n
Understanding loop statements<\/h2>\n
Loop statements allow your program to repeat a block of code multiple times. The two most commonly used loop statements are:<\/p>\n
for loop<\/b>: This loop iterates over a sequence of elements and executes a block of code for each element. The syntax is:<\/p>\nfor item in sequence:\r\n # Code to execute for each item<\/code><\/pre>\nwhile loop: <\/b>This loop continues to execute a block of code as long as a given condition is true. The syntax is:<\/p>\nwhile condition:\r\n # Code to execute while condition is true<\/code><\/pre>\nExample:<\/p>\n
fruits = [\"apple\", \"banana\", \"orange\"]\r\nfor fruit in fruits:\r\n print(f\"I love eating {fruit}.\")<\/code><\/pre>\n![\"\"](\"https:\/\/accuweb.cloud\/resource\/wp-content\/uploads\/2024\/01\/Entry-Control-Loops.png\")
<\/h3>\nEntry Control Loops<\/h2>\n
In Python, entry control loops rely on checking a condition before executing the loop body. If the condition evaluates to True, the loop body runs. This means the loop might not even execute if the condition is initially False.<\/p>\n
Examples:<\/p>\n
for loop: <\/b>Iterates through a sequence of elements, executing the loop body for each element.<\/p>\nfruits = [\"apple\", \"banana\", \"orange\"]\r\nfor fruit in fruits:\r\n print(f\"I love eating {fruit}.\")<\/code><\/pre>\nif statement:<\/b> Can be used to create an entry control loop by checking a condition and running code only if it’s True.<\/p>\nnumber = int(input(\"Enter a number: \"))\r\nif number >= 10:\r\n print(f\"The number {number} is greater than or equal to 10.\")<\/code><\/pre>\nExit Control Loops<\/h2>\n
Exit control loops in Python check a condition after executing the loop body. The loop continues to iterate until the condition becomes False. This guarantees the loop body runs at least once, even if the condition is initially False.<\/p>\n
Examples:<\/p>\n
while loop:<\/b> Executes the loop body repeatedly until the condition becomes False.<\/p>\ncount = 0\r\nwhile count < 5:\r\n print(f\"Counting... {count}\")\r\n count += 1<\/code><\/pre>\ndo-while loop:<\/b> (Not a built-in loop in Python<\/u>) Similar to while loop<\/i><\/b> but guarantees the loop body executes at least once.<\/p>\n# Simulating a do-while loop\r\ncondition = True\r\nwhile True:\r\n # Code to execute\r\n \r\n # Update the condition\r\n if not condition:\r\n break<\/code><\/pre>\nChoosing the Right Loop<\/h2>\n
Use entry control loops when:<\/p>\n
You need to iterate through a set number of times or a known sequence.
\nThe condition determines whether to execute the loop body at all.<\/p>\n
Use exit control loops when:<\/b><\/p>\n
You want to continue iterating until a specific condition becomes False.
\nThe loop body needs to execute at least once.<\/p>\n
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