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#include <stdio.h>
int main(void)
{
char c;
unsigned short numBlanks = 0;//number of blanks stored
unsigned short i;//loop int
while ((c=getchar()) != EOF)//keep on accepting input characters until EOF is given
{
if (c == ' '){++numBlanks;}//if character is space, number of blanks+=1
if (c == ' '){numBlanks += 4;}//if character is tab, number of blanks+=4
if ((c != ' ') && (c != ' ') && (numBlanks > 0))//if there were previously recorded blanks, but current is a non-blank character, print the optimised amount of blanks
{
if ((numBlanks % 4) == 0)//if the number of spaces are evenly divisable by 4, only print tabs.
{
for (i=0;i<(numBlanks/4);++i){putchar(' ');}//place tab for every 4 spaces
numBlanks = 0;//we are done printing all blanks
}
else //otherwise, go into tab/space mode
{
while (numBlanks != 0)//keep on printing until there are no more blanks to print
{
if (numBlanks > 3){putchar(' '); numBlanks -= 4;}//if the number of blanks is 4 or above, print a tab and reduce the number of blanks
else {putchar(' '); --numBlanks;}//otherwise, print a single blank
}
}
}
if (numBlanks == 0)//if character is non-blank, or all blanks have just been printed, print the character
{
putchar(c);
}
}
return 0;
}
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