Q.What is a runtime error?

Mistakes in a program are called errors or bugs, and C programmers classify them into three kinds according to when and how they show up. Distinguishing them is a common exam requirement.

• Syntax errors - violations of the grammar rules of C, such as a missing semicolon, an unmatched brace, or a misspelt keyword. The compiler detects these and refuses to translate the program until they are fixed.
• Logical errors - the program compiles and runs, but produces the wrong result because the logic or formula the programmer used is incorrect. The compiler cannot detect these; they are found only by testing with data whose correct answer is known.
• Runtime errors - errors that occur while the program is running, such as dividing by zero, using an array index that is out of range, or running out of memory. The program stops or misbehaves during execution. …