Intro to cprogramming
- 2. HISTORY OF C LANGUAGE LATE 60’s:MIT,GE and Bell labs partnered to build MULTICS create “B” Language EARLY 70’s:From The “B” Language, Dennis Ritchie developed “C” Later Dennis Ritchie and Brian Kernighan together published “The white book”
- 3. Middle Level Language ? . C Programming bridges gap between traditional Machine Understandable Machine Level language and more conventional High level languages. User can Use C Language to do system programming for writing operating system as well as application programming.
- 5. Why “C”? Easy to learn Structured language It produces efficient programs. It can handle low-level activities. It can be compiled on a variety of computers.
- 6. Facts about C C was invented to write an operating system called UNIX. C is a successor of B language which was introduced around 1970 The language was formalized in 1988 by the American National Standard Institute (ANSI). By 1973 UNIX OS almost totally written in C. Today C is the most widely used System Programming Language. Most of the state of the art software have been implemented using C Ex:Google Chrome
- 7. Basic elements Of C Program Preprocessor Commands Functions Variables Statements & Expressions Comments
- 8. Let us look at a simple program that would print "Hello World"
- 9. HELLO WORLD #include <stdio.h> int main() { /* My first program */ printf("Hello, World! n"); return 0; }
- 10. #include <stdio.h> Preprocessor Commands These commands tells the compiler to do pre processing before doing actual compilation. Like #include <stdio.h> is a preprocessor command which tells a C compiler to include stdio.h file before going to actual compilation .
- 11. intmain() Functions Functions are main building blocks of any C Program. Every C Program will have one or more functions and there is one mandatory function which is called main( ) function. This function is prefixed with keyword int w hich means this function returns an integer value whe n it exits. This integer value is returned using return statement
- 12. printf Built in Functions The C Programming language provides a set of built-in functions. In the above example printf() Is a C built-in function which is used to print anything on the screen. Other built in Functions: scanf char *strcpy void* memcpy
- 13. Variables They are used to hold numbers, strings and complex data for manipulation A variable is just a named area of storage that can hold a single value (numeric or character). The C language demands that you declare the name of each variable that you are going to use and its type, or class, before you actually try to do anything with it. The Programming language C has two main variable types Local Variables Global Variables
- 14. Comments /*My First program */ They are used to give additional useful information inside a C Program. All the comments will be put inside /*...*/ as given in the example above. A comment can span through multiple lines.
- 15. Caution There are certain Rules C is a case sensitive programming language. It means in C printf and Printf will have different meanings C has a free-form line structure. End of each C statement must be marked with a semicolon. White Spaces (ie.. tab space and space bar ) are ignored.
- 16. THE END