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where ever do you want to assign two or more variable in for loop or you want to check two or more condition or increment or decrement two or more variable you can use the comma(,) factor in for loop.

EX:-

for(i=0;i<=5;i++)

{

j=5;

printf("%d",j);

j--;

}

instead of above code you can do as below

EX:-

for(i=0,j=5;i<=5;i++,j--)

{

printf("%d",j);

}

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