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-   C (http://www.go4expert.com/forumdisplay.php?f=20)
-   -   convert for loop into while and do..while (http://www.go4expert.com/showthread.php?t=7815)

philay 12Dec2007 19:21
convert for loop into while and do..while
 
Code:
#include<stdio.h>
int main ()
{
int i,j;

for(i=1;i<=5;i++)  {
  for(j=1;j<=i;j++)
    printf("%i",i);
  printf("\n");
}

return 0;

}
The output is
1
22
333
4444
55555

this is the "for" method, how do i convert it into while and do..while format? i just still noob in programming , any expert help me out pls? thx

Salem 12Dec2007 19:36
Re: convert for loop into while and do..while
 
for ( a ; b ; c ) d;

Is approximately
a;
while ( b ) { d; c; }

philay 12Dec2007 19:51
Re: convert for loop into while and do..while
 
ya, but if got 2 loops? for(i=0;i<=8;i++) the first loop then inside another for (j=0;j<=i;j++)?

Salem 12Dec2007 22:12
Re: convert for loop into while and do..while
 
So two for loops become two while loops - what's the problem?

philay 13Dec2007 06:25
Re: convert for loop into while and do..while
 
Code:
int i=1,j=1;

while(i<=5)  {
    printf("%i",i);
    i++;
    while(j<=i)  {
      printf("\n");
      j++;
}
but if i write like this, i compile cant get the correct output same as the for loop
1
22
333
4444
55555

philay 13Dec2007 06:28
Re: convert for loop into while and do..while
 
Code:
int i=1,j=1;

do {
  printf("%i",i);
  i++;
do {
  printf("\n");
  j++;
}while(j<=i);
}while(i<=5);

shabbir 13Dec2007 08:18
Re: convert for loop into while and do..while
 
For while loop you should increment the counter as the last statement and then it will be equivalent.

Do while loops are a bit different and cannot be equal to for loop but in your case applying the increment as the last statement of the loop would do.

philay 13Dec2007 10:14
Re: convert for loop into while and do..while
 
i don't really get what u really mean.. how about u post the code for me? then i will know better

Salem 13Dec2007 12:36
Re: convert for loop into while and do..while
 
Refer to my other post
Code:
for(i=1;i<=5;i++)  {
  for(j=1;j<=i;j++)
    printf("%i",i);
  printf("\n");
}
Becomes
Code:
i=1;
while ( i<=5 ) {
  for(j=1;j<=i;j++)
    printf("%i",i);
  printf("\n");
  i++;
}
Now apply the same transformation to the inner loop, and you're done.

philay 13Dec2007 14:19
Re: convert for loop into while and do..while
 
kk, thx so much for the help


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