C programming is an High Level Programming Language. It is developed by Dennis Ritchie between 1969 and 1973 at AT & T Bell Labs.
Example: Definition before start programming we have to know basic things. /* for comment about program */ header files are required, these are standard input/output library files. examples,
- #include<stdio.h>
- #include<conio.h>
- #include<math.h>
- #include<ctype.h>
- #include<string.h> etc.
the header files are always start with # character set and enclosed with less then greater than sign
void main() or main():
The main function is used for execute the program from beginning, this is means every program contain main function, the main function always enclosed with braces ().
Example:
/* A program to print hello world*/
--- Comment about program.
#include<stdio.h>/*Header files- or preprocessor*/
int main(void)/* main finction*/
{/* statement start with curly braces*/
printf("Hello,world"); /* it is end with semicolon signs ;*/
return 0;}
/* statement closed with curly braces*/
Explanation of this program.
/* this program…*/
The symbols /* and */ are comment. Comments are ignored by the compiler, and it is used to provide useful information for humans that will read the program.
void main ()
C program consist of one or more functions. Void main is known as a function not a variable. () used to denote the function.
{…..}
Braces are the body of the function, which consist of one or more instructions (statement).
Printf();
Is a library function that is used to print on the standard input/output.
“Hello Worldn”
It is a string constant.
n
Is the newline character or these are called escape sequence characters.
;
A semicolon terminates a statement.
Return 0;
Return the value zero to the operating system. Note: C is case sensitive, so the names of the functions (main and printf) must be typed in lower case as above.
