Learn C++ For Loop from Scratch: From Syntax to Examples

In C++, the `for` loop is used to handle repetitive tasks with a fixed number of iterations, avoiding the need to manually repeat code (e.g., printing numbers from 1 to 10 would require 10 lines of `cout` statements, but a loop can do this in just a few lines). The basic syntax is `for(initialization; condition; update) { loop body }`, where the three components are: initialization (assigning an initial value to the loop variable, executed only once), condition (a boolean expression; the loop body runs if this is `true`), and update (adjusting the loop variable, such as `i++`). Examples include printing numbers from 1 to 10 (where `i` ranges from 1 to 10, with the loop body outputting `i`), and calculating the sum of numbers from 1 to 10 (using a `sum` variable to accumulate values of `i`, resulting in 55). Common variations allow omitting initialization or update (but this can easily cause infinite loops). For single-line loop bodies, adding `{}` is recommended to avoid logical errors. Nested loops are also supported (e.g., the 9×9 multiplication table, where the outer loop controls rows and the inner loop controls columns). Key considerations include avoiding infinite loops (e.g., non-terminating conditions), variable scope issues (variables defined inside the loop are not accessible outside), and ensuring the condition is not inverted. Mastery of the `for` loop requires understanding the roles of the three components and practicing with simple examples such as summation (and other basic use cases). (Note: The original text was truncated at "summation,", but the translation includes the completed context based on standard content about `for` loops.)