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What is the return value from printf() function?

What is the return value from printf() function?

printf function always returns the number of characters printed. Let us understand this with an example:

main()
{
int a=10;
printf("%d",printf("%d %d %d", a,a,a));
}

In this above program the inner printf is first called which prints value of a, three times with space between each value, 10 10 10. Total 5 characters get printed (3 value of 10 and 2 spaces).