Operators in C | comma operator

comma operator(,)

comma operator(,)helps us to separate variables when they are declared.

int a,b,c;

c=(a=10);
printf(“c=%d\n”,c);
c=(a=10,a+4);
printf(“c=%d\n”,c);
c=(a=5,a+6,a+20);
printf(“c=%d\n”,c);
c=(a=20,a+10,a+6,a-3);
printf(“c=%d\n”,c);
c=(a=3,a+10,a-5,a+2,a-7);
printf(“c=%d\n”,c);
c=(a=40,a+5,a-7,a+20,a-3);
printf(“c=%d\n”,c);

Example:1

/* 
comma_1.cpp
*/
#include<stdio.h>
int main()
{
     int a,c;
     c=(a=10);
     printf("1. c = %d\n",c);
     c=(a=10,a+20);
     printf("2. c = %d\n",c);
     c=(a=10,a+20,a-4);
     printf("3. c = %d\n",c);
     c=(a=10,a+20,a+45,a+2);
     printf("4. c = %d\n",c);
     c=(a=10,a+20,a+34,a-7);
     printf("5. c = %d\n",c);
     c=(a=10,a+20,a);
     printf("6. c = %d\n",c);
     return(0);
}

/* Output */
1. c = 10
2. c = 30
3. c = 6
4. c = 12
5. c = 3
6. c = 10

Example:2

/* 
comma_2.cpp
*/
#include<stdio.h>
int main()
{
	int a,b,c,d;
	d=(a=10,b=20,c=30);
	printf("1. d = %d\n",d);
	d=a=10,b=20,c=30;
	printf("2. d = %d\n",d);
	return(0);
}

1. d = 30
2. d = 10