To Write a C program to remove the repeated characters in
the entered expression or in entered characters(i.e)
removing duplicates.

Answer Posted / lijun li

#include <stdio.h>

main(int argc, char **argv)
{
int i;
char *source = argv[1];
char *dest;
char *temp;

unsigned int bitmap[8] = {0,0,0,0,0,0,0,0};
unsigned char c;
unsigned int mask;

dest = (char*)malloc(strlen(source));
temp = dest;

printf("before %s\n", source);
i=0;
while(source[i])
{
c = source[i];
mask = 1 << (c % 32);

if ((bitmap[c/32] & mask) == 0)
{
*temp++ = source[i];
bitmap[c/32] |= mask;
}
i++;
}

*temp = '\0';

printf("after %s\n", dest);
}

Is This Answer Correct ?    15 Yes 22 No



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