2 8 Common Programming Errors Syntax Errors Figure

2. 8 Common Programming Errors • Syntax Errors (Figure 2. 15) – missing semicolon at the end of the variable declaration (line 271) – undeclared variable miles (line 275 & 278) – last comment is not closed because of blank in */ closecomment sequence (line 280) • Run-Time Errors (Figure 2. 16) – an attempt to perform an invalid operation, detected during program execution • Undetected Error and Logic Errors (talks later) 中正大學通訊 程系 潘仁義老師 Advanced Network Technology Lab 1

Figure 2. 15 Compiler Listing of a Program with Syntax Errors 中正大學通訊 程系 潘仁義老師 Advanced Network Technology Lab 2

Figure 2. 16 A Program with a Run-Time Error 中正大學通訊 程系 潘仁義老師 Advanced Network Technology Lab 3

Common Programming Errors • Undetected Errors – a very common source of incorrect results in C programs is the input of a mixture of character and numeric data. • Logic Errors – an error caused by following an incorrect algorithm. 中正大學通訊 程系 潘仁義老師 Advanced Network Technology Lab 4

Figure 2. 17 Revised Start of main Function for Coin Evaluation 中正大學通訊 程系 潘仁義老師 Advanced Network Technology Lab 5

Figure 2. 18 A Program That Produces Incorrect Results Due to & Omission 中正大學通訊 程系 潘仁義老師 Advanced Network Technology Lab 6