C Programming concept.
Anything in structured format is easy to understand. C is a structured language. We can easily debug, test and maintain the program by learning the structure.
Structure Of a C Program:
Include header file section
Global declaration section
main()
{
Declaration part
Executable part
}
User-Defined function
{
Statements
}
- When we use function, variables and constant in program, we may need function definition so we use Header files. (use #include and extend with .h)
- In Global Declaration section we can declare variables which are used in more than one function.
- The execution of the program begins in the function main().
- Initialization and declaration of variable in the executable part is done in Declaration part.
- Executable part contain set of statement enclosed with braces.
- The function defined by the user is called User Defined function.
SAMPLE PROGRAM:
Write a C program to add two numbers.
#include<stdio.h> /* standard input and output, to get input and show output */
void main() /* function returning value will be null */
{
int a,b,s; /* declaring integer variable , a and b for two num, s for sum */
printf("enter the 2 num:"); /* to print the two numbers in output screen */
scanf("%d%d",&a,&b); /* accept input, %d to read integer, & is used to place the read value in variable */
s=a+b; /* arithmatic operation to add */
printf("sum=%d",s); /* to print arithmetic result */
getch(); /* used to hold output screen until user gives any type of input */
}
Output:
Enter two num: 5
6
Sum=11
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