In programming languages, the keyword 'break' (to exit a loop or switch immediately) is used in which of the following?

Introduction / Context:Control-flow statements vary across languages. The 'break' statement is widely associated with C and its derivatives (C++, Java, JavaScript) to terminate loops or switch-case blocks immediately. Identifying its origin helps map concepts across languages.

Given Data / Assumptions:

• Fortran 77: uses DO loops and arithmetic IF/GO TO; no 'break' keyword.
• Pascal: uses 'exit' or structured control like 'while', 'repeat-until'; classical Pascal lacks a 'break' keyword.
• C language: defines 'break' for loops and switch.

Concept / Approach:

We match the exact keyword and semantics. 'break' in C exits the nearest enclosing loop or switch. Other languages may have similar capabilities but different keywords or idioms (e.g., Fortran’s EXIT appears in later standards, not Fortran 77).

Step-by-Step Solution:

Verification / Alternative check:

C references (K&R) and modern C standards document 'break' clearly, including behavior in nested structures.

Why Other Options Are Wrong:

• Fortran 77 and Pascal: different control constructs; lack the exact 'break' keyword in classic forms.
• none of the above/COBOL: do not match the described C keyword and semantics.

Common Pitfalls:

Assuming modern Fortran's EXIT or Pascal dialect extensions equate to classic 'break' keyword; the question targets the standard historic keyword usage.

Final Answer:

C