c Comma Operator in ‘for’ Loops

The Comma Operator in ‘for’ Loops

The COMMA OPERATOR (,) is primarily used in conjunction with the ‘for’

statement

This OPERATOR permits two different expressions to appear with in the

‘for’ Loop Syntax.

Syntax:

for(expr1, expr2; expr3; expr4, expr5)

{

Executional Statements;

}

Illustrative Example1

Program

#include<stdio.h>

#include<conio.h>

void main()

{

int x = 0, j, k;

clrscr();

printf("\n\nThe Values of K, J, X are...\n\n");

printf("\n\tK\tJ\tX\n");

printf("\t-----------------\n");

for(k = 0, j = 5; k < 5, j > 0; k = k + 2, j--)

{

x++;

printf("\n\t%d\t%d\t%d", k, j, x);

}

}

Illustrative Example2

Program

#include<stdio.h>

#include<conio.h>

void main()

{

int x = 0, j, k;

clrscr();

printf("\n\nThe Values of K, J, X are...\n\n");

printf("\n\tK\tJ\tX\n");

printf("\t-----------------\n");

for(k = 0, j = 5; j > 0, k < 5; k = k + 2, j--)

{

x++;

printf("\n\t%d\t%d\t%d", k, j, x);

}

}

Program to print a sequence top to down and vice-versa

Program

#include<stdio.h>

#include<conio.h>

void main()

{

int up, down;

clrscr();

printf("\n\tUp\tDown\n");

printf("\t-----------\n");

for(up = 1, down = 10; up <= 10; up++, down--)

printf("\n\t%d\t%d", up, down);

}