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character set, identifiers, keywords Character set: A character denotes any alphabet, digit or special symbol used to represent information. Valid alphabets, numbers and special symbols allowed in C are The alphabets, numbers and special symbols when properly combined form constants, variables and keywords. Identifiers: Identifiers are user defined word used to name of entities like variables, arrays, functions, structures etc. Rules for naming identifiers are: 1) name should only consists of alphabets (both upper and lower case), digits and underscore (_) sign. 2) first characters should be alphabet or underscore 3) name should not be a keyword 4) since C is a case sensitive, the upper case and lower case considered differently, for example code, Code, CODE etc. are different identifiers. 5) identifiers are generally given in some meaningful name such as value, net_salary, age, data etc. An identifier name may be long, s...
Steps for Compiling and executing the Programs A compiler is a software program that analyzes a program developed in a particular computer language and then translates it into a form that is suitable for executionon a particular computer system. Figure below shows the steps that are involved in entering, compiling, and executing a computer program developed in the C programming language and the typical Unix commands that would be entered from the command line. Step 1: The program that is to be compiled is first typed into a file on the computer system. There are various conventions that are used for naming files, typically be any name provided the last two characters are “.c” or file with extension .c. So, the file name prog1.c might be a valid filename for a C program. A text editor is usually used to enter the C program into a file. For example, vi is a popular text editor used on Unix systems. The program that is entered into the file is known as the source program becaus...
Break and Continue: Break Vs Continue break continue A break can appear in both switch and loop ( for , while , do ) statements. A continue can appear only in loop ( for , while , do ) statements. A break causes the switch or loop statements to terminate the moment it is executed. Loop or switch ends abruptly when break is encountered. A continue doesn't terminate the loop, it causes the loop to go to the next iteration. All iterations of the loop are executed even if continue is encountered. The continue statement is used to skip statements in the loop that appear after the continue . The break statement can be used in both switch and loop statements. The continue statement can appear only in loops. You will get an error if this appears in switch statement. When a break statement is encountered, i...
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