C program without using main function

Write a C program without using main function.
In this program, we didn’t use the main function, but we are using the preprocessor directive #define with arguments to define the Main function.
A Preprocessor is program which processes the source code before compilation.
The ‘##‘ operator is called the token pasting or token merging operator. In the second line of program we used it to merges the 4th,1st,3rd & the 2nd characters(tokens), and it compiles as “msut”.
When the controller calls int begin, preprocessor replaces the macro “begin” with the expansion decode(a,n,i,m,a,t,e). As defined in the macro decode it merges the 4th,1st,3rd & the 2nd characters, and int begin becomes int main(), so program runs successfully. Read more about C Programming Language . and read the C Programming Language (2nd Edition). by K and R.
–>

/***********************************************************
* You can use all the programs on www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
*
* Happy Coding
***********************************************************/

#include<stdio.h>
#define decode(s,t,u,m,p,e,d) m##s##u##t
#define begin decode(a,n,i,m,a,t,e)

int begin()

{
printf(” Ha HA see how it is?? “);
}
Read more Similar C Programs

Graphics in C

C Strings
C Aptitude 

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

–> To browse more C Programs visit this link
(c) www.c-program-example.com

K & R C Programs Exercise 7-9.

K and R C, Solution to Exercise 7-9:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
Write a C Functions like isupper() can be implemented to save space or to save time. Explore both possibilities. Read more about C Programming Language .
isupper: return 1 (true) if c is an upper case letter
Normal C function:

int  isupper(char c)
{
if (c >= 'A' && c <= 'Z')
return 1;
else
return 0;
}

This simple code tests the character is upper or lower , If the character within the range of ASCII upper case letters it returns 1, otherwise 0.
To save space or to save time using the macros is the best possibility
C Code:

#define isupper(c)  ((c) > = 'A' && (c) <= 'Z') ? 1:0

Macro version of isupper is more efficient because, there is no overhead of the function call and it uses more space because the macro is expanded in line every time it is invoked.

Read more c programs
C Basic
C Strings
K and R C Programs Exercise

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link
(c) www.c-program-example.com

K & R C Programs Exercise 4-14.

K and R C, Solution to Exercise 4-14:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
Write C Program to swap two arguments using macros.
C Program to swap(t, x, y) that interchanges two arguments of type t using the block structure.

/***********************************************************
* You can use all the programs on www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
*
* Happy Coding
***********************************************************/

#include <stdio.h>

#define swap(t, x, y)
do {
t safe ## x ## y;
safe ## x ## y = x;
x = y;
y = safe ## x ## y;
} while (0)

int main(void) {
int inum1, inum2;
double dnum1, dnum2;
char *ch1, *ch2;
printf("nEnter two Intgers:n");
scanf("%d%d",&inum1,&inum2);
printf("nIntegers before swap:n inum1= %dn inum2= %dn", inum1, inum2);
swap(int, inum1, inum2);
printf("nIntegers after swap:n inum1= %dn inum2= %dn", inum1, inum2);

printf("nEnter two Doubles:n");
scanf("%f%f",&dnum1,&dnum2);
printf("nDoubles before swap:n dnum1= %gn dnum2= %gn", dnum1, dnum2);
swap(double, dnum1, dnum2);
printf("nDoubles after swap:n dnum1= %gn dnum2= %gn", dnum1, dnum2);

printf("nEnter two Strings:n");
scanf("%s%s",ch1,ch2);
printf("n Strings before swap:n ch1= %sn ch2 = %sn", ch1, ch2);
swap(char *, ch1, ch2);
printf("nStrings after swap:n ch1= %sn ch2= %sn", ch1, ch2);

return 0;
}
Read more Similar C Programs
C Basic
C Strings
K and R C Programs Exercise

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link
(c) www.c-program-example.com

C Program to find sum and product using macros.

Write C Program to find sum and product using macros.
Macro is a piece of text that is expanded by the preprocessor part of the compiler. This is used in to expand text before compiling. Macro definitions (#define), and conditional inclusion (#if). In many C implementations, it is a separate program invoked by the compiler as the first part of translation.Read more about C Programming Language .

/***********************************************************
* You can use all the programs on www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
*
* Happy Coding
***********************************************************/

#include<stdio.h>
#define SUM(A, B) (A + B)
#define PROD(A, B) (A * B)
int main()
{
int num1, num2, sum, product;
printf("nEnter the Two numbersn");
scanf("%d%d",&num1,&num2);
sum=SUM(num1,num2);
product=PROD(num1,num2);
printf("nnSum of two numbers using Macros is:%dn",sum);
printf("nnProduct of two numbers using macros is:%dn",product);
return 0;
}
Read more Similar C Programs
Learn C Programming

Number System

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

To browse more C Programs visit this link
(c) www.c-program-example.com

C Program to demonstrate macros.

C Program to demonstrate macros. Macro is a piece of text that is expanded by the preprocessor part of the compiler. This is used in to expand text before compiling. Macro definitions (#define), and conditional inclusion (#if). In many C implementations, it is a separate program invoked by the compiler as the first part of translation.Read more about C Programming Language .

/***********************************************************
* You can use all the programs on www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
*
* Happy Coding
***********************************************************/

#include<stdio.h>
#define SQUARE(x) x*x

main()
{
int value=3;

printf("%d n", SQUARE(value));
}
Read more Similar C Programs
Learn C Programming

Number System

You can easily select the code by double clicking on the code area above.

To get regular updates on new C programs, you can Follow @c_program

You can discuss these programs on our Facebook Page. Start a discussion right now,

our page!

Share this program with your Facebook friends now! by liking it

(you can send this program to your friend using this button)

Like to get updates right inside your feed reader? Grab our feed!

(c) www.c-program-example.com