Answer Posted / raghuram.a

#include<stdio.h>
long pow(long a,long b) /*finds a power of b*/
{
long i,j=1;
for(i=1;i<=b;i++)
j*=a;
return j;
}
long bin(int n) /*converts into binary equivalent */
{
long i=0,j=1,r;
while(n)
{
r=n%2;
i=i+r*j;
n/=2;
j*=10;
}
return i;
}
main()
{
char a[25];
long i,j,k,m,l=0,n=0;
printf("\nEnter string:");
scanf("%s",a);
printf("\nAll possible substrings are:\n");
while(a[l])
l++;
printf("%d)\t{ }\n",++n);
for(i=1;i<pow(2,l);i++)
{ k=bin(i);
m=l-1;
printf("%d)\t{ ",++n);
while(m>=0)
{
j=k/pow(10,m);
if(j==1)
printf("%c",a[l-1-m]);

k=k%pow(10,m);
m--;
}
printf("\t}\n");
}
return 0;
}

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