Accepting Command Line arguments:
- Every C application runs by Computer Operating System.
- OS runs the program from its environment.
- Every OS consists CUI and GUI mode.
- To read command line arguments, we need to run the C program from CUI OS mode.
Run application from Command prompt:
- Cmd Prompt is Ms-DOS
- It is Command User Interface.
- OS takes command as input and open specified application which is present in that machine.
- We compile and run the code from command line using tcc compiler as follows
Note: save into “turboc” folder with name Program.c
Open command prompt:
C:/turboc> tcc Program.c
-> Generate Program.exe file
-> Generate output.
main() prototype: Regular main() function prototype is slightly different from the main() function taking command line arguments. We must define main() function as follows
int main(int argc , char* argv[ ])
- ‘argc’ = argument count ( Number of arguments passed including file name)
- ‘argv’ = argument vector(list) (List of arguments – default type is String)
Why argument type is String by default?
- In any programming language, only String type can hold any data.
- main(int) –> can take only integers
- main(float) –> can take only float values.
- main(char* ) –> can hold any type of data.
- char* a = “10”;
- char* b = “23.45”;
- char* c = “g”;
- char* d = “CBook”;