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why we shiuld use main keyword in C
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Answer / siddiqui mohd. faisal
main is a keyword which tells the compiler that actual
program starts from here.
| Is This Answer Correct ? | 16 Yes | 8 No |
Answer / nirmal kumar tailor
main() is the important part of the programe.
main() defines scope of the programe and all working in
this scop means execute the programe in between this block
all programe execution with the main() function.
| Is This Answer Correct ? | 8 Yes | 1 No |
Answer / shireesha
It invokes the other functions defined in the program.
It provides the starting address for the funtion.
| Is This Answer Correct ? | 8 Yes | 3 No |
Answer / gg
Every C program should have at least one function.main() is
special function, from here the actual execution of the
program starts. main() is one which calls all other
functions and helps to do their job.The functions may from
library or user defined.
| Is This Answer Correct ? | 4 Yes | 2 No |
Answer / raj
main() is the enty point of all the application ,and is the
special function because it is invoked by the OS
routines,through this function we can call any function.So
every application must contain main() function.
| Is This Answer Correct ? | 4 Yes | 3 No |
? ???Mirror Mirror on the wall????????
main() { int i; for(i=0;i<5;i++) printf("%d",1l<<i); } why doesn't 'l' affect the code??????
How to find the given no is odd or even without checking of any condition and loops. (Hint: Using array)
The OS is a program that uses various data structures. Like all programs in execution, you can determine the performance and other behavior of the OS by inspecting its state - the values stored in its data structures. In this part of the assignment, we study some aspects of the organization and behavior of a Linux system by observing values of kernel data structures exposed through the /proc virtual file system. The /proc virtual file system: Linux uses the /proc file system to collect information from kernel data structures. The /proc implementation provided with Linux can read many different kernel data structures. If you cd to /proc on a Linux machine, you will see a number of files and directories at that location. Files in this directory subtree each corresponds to some kernel data structure. The subdirectories with numeric names contain virtual files with information about the process whose process ID is the same as the directory name. Files in /proc can be read like ordinary ASCII files. You can open each file and read it using library routines such as fgets() or fscanf(). The proc (5) manual page explains the virtual files and their content available through the /proc file system. Requirements in detail: In this part, you are asked to write a program to report the behavior of the Linux kernel. Your program should run in two different versions. The default version should print the following values on stdout: • Processor type • Kernel version • The amount of memory configured into this computer • Amount of time since the system was last booted A second version of the program should run continuously and print lists of the following dynamic values (each value in the lists is the average over a specified interval): • The percentage of time the processor(s) spend in user mode, system mode, and the percentage of time the processor(s) are idle • The amount and percentage of available (or free) memory • The rate (number of sectors per second) of disk read/write in the system • The rate (number per second) of context switches in the kernel • The rate (number per second) of process creations in the system If your program (compiled executable) is called proc_parse, running it without any parameter should print out information required for the first version. Running it with two parameters "proc_parse <read_rate> <printout_rate>" should print out information required for the second version. read_rate represents the time interval between two consecutive reads on the /proc file system. printout_rate indicates the time interval over which the average values should be calculated. Both read_rate and printout_rate are in seconds. For instance, proc_parse 2 60 should read kernel data structures once every two seconds. It should then print out averaged kernel statistics once a minute (average of 30 samples). The second version of your program doesn't need to terminate.
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