Thread: Need help.

So basicly I have some homework to do, useing for and then while do I need to write this
1 x 1 = 1

2 x 1 = 2

3 x 1 = 3

...
9 x1 = 9

10 x1 = 10
1 x 2 = 2
2 x 2 = 4

...
9 x 10 = 90
10 x 10 = 100

I managed to do it useing for but I just cant get how to do it useing while and do.

Code:

  int main()  {
      
int a; 
int b;

for(a = 1;a < 11; ++a ) {
   for(b = 1;b < 11; ++b) {
       int c = a*b; 
       printf(" %4d x %4d = %4d \n", a, b, c);
       
 }
 }
 return 0;
 }

This is what I tried with while do

Code:

int main() {

int a = 0;
int b = 1;

do
{ 
++a;
int c = a*b;
printf("%4d   X %4d = %4d \n",a, b, c);
} 
while(a<10); 
    
}

Two loops is still two loops, so two for-loops will become two do-while loops. (Or at least, that's the most natural way to do it. If you have to, you can unroll it out to a single loop (either do/while or for), but there's no reason to do that unless specifically requested.)

Well, if a for loop is

Code:

for (initializing; checking; increment) {
    loop-body
}

then a do-while loop is

Code:

initializing
do {
    loop-body
    increment
} while (checking)

with the only exception being that a do-while loop will always run at least once, while a for-loop might not. In this case we can see by inspection that the for-loops also run at least once, so that's not a problem.