Structure of a C program
C is a structured language, made up of collection of procedures which consists of declarations, statements and other elements, C compiler starts the execution from the function name main(). Every C program have the function main() which is special function and it may also contain other functions or user defined functions.
The statement or a group of statements under the functions should be present within a pair curly braces { }. Each statement should be terminated by a semicolon ; .
The program structure in C
- Including the header files
- Global variables and functions declaration which is optional.
- Main function
- Local variable and Function declaration
- Statements
- other functions
Comments / Remarks in C begin with /* ( a slash and star) and end with */ ( a star and slash). You can enter multi-line remarks or comments in C with a beginning /* ..... comments..... */
Example of a C program :
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/* A program calculate the sum two numbers */
#include[stdio.h] /* including header file stdio.h
#include[conio.h]
main()
{
int a,b,sum;
printf("enter two numbers")
scanf("%d%d",&a,&b);
sum=a+b;
printf("the sum of two numbers = %d ", sum);
}
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Running a program
A C program must be converted to .exe or .com to run directly and also for hiding the code. But while writing the code you can run the program by ctrl+F9. Now to make a C code or program .exe then simply press F9, it will save the program in xxx.exe (where xxx.your file name)
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