C Programming - Control Instructions - Discussion

The 4th statement is "CAN BE USED" which suggests in some cases not always. If the statement was always be used for executing the body at least once. Then the answer would be "do...while".

How is for loop slower than while loop?

Only do...while loop can be used to execute statement atleast once.

If we want to execute a statement at least once, whatever the condition is true or false in this case we should use do-while loop instead of for loop. In do-while loop first statement is executed then condition is checked. While in FOR loop first condition is checked then statement is executed.

@Akash.

Both while and for loop are looks some what same and only difference is for loop looks simple than while, because all expressions are stated in a single for loop, where user can understand easily by looking for.

For(;;); here is semicolon is present after for then how it became a infinite loop.

I am not agree with 4th statement. Who is agree with 4th statement, please explain how to do following program using for loop & having same answer as after this program execution.

void main()
{
int i=10;
do
{
i++;
printf("i=%d",i);
}while(i<10);
}

This program is gives you answer 11;

Note: If you think about for(;;) statement than we get same answer with while(1) statement also. i.e. I want to say is for & wile are entry controlled block & do....while is exit controlled block.....any one having different suggestion please reply to this post.

I think statement 3 is right.

int i=5;
for(;i<4;i++)
{
printf("%d",i);
}

It will not print at least one time.

How for loop is used to execute statements atleast once?

How come statement 3 be true?

We cannot put a semicolon after for bracket.