The following program reads a string as an input, displays the unique letters in the string in descending order.
For example, if the input is
innovation
the output of the program will be
vtonia
//Program to sort unique characters in a string
# include <stdio.h>
int main()
{
char s[100],d[100],temp;
int i=0,n,j=0,k;
printf("Enter string\n");
scanf("%s",s);
while (s[i++]!='\0');
n=i;
if (n>=3 && n<100)
{
for(i=0;i<n;i++)
{
for(k=0;k<=j;k++)
{
if (s[i]==d[k])
break;
}
if (k>j)
d[j++]=s[i];
}
d[j]='\0';
for(i=0;i<j-1;i++)
for(k=i+1;k<j;k++)
{
if (d[i]<d[k])
{
temp=d[i];
d[i]=d[k];
d[k]=temp;
}
}
printf("String after sorting\n");
printf("-----------------------\n");
printf("%s",d);
}
return 0;
}
OUTPUT
For example, if the input is
innovation
the output of the program will be
vtonia
//Program to sort unique characters in a string
# include <stdio.h>
int main()
{
char s[100],d[100],temp;
int i=0,n,j=0,k;
printf("Enter string\n");
scanf("%s",s);
while (s[i++]!='\0');
n=i;
if (n>=3 && n<100)
{
for(i=0;i<n;i++)
{
for(k=0;k<=j;k++)
{
if (s[i]==d[k])
break;
}
if (k>j)
d[j++]=s[i];
}
d[j]='\0';
for(i=0;i<j-1;i++)
for(k=i+1;k<j;k++)
{
if (d[i]<d[k])
{
temp=d[i];
d[i]=d[k];
d[k]=temp;
}
}
printf("String after sorting\n");
printf("-----------------------\n");
printf("%s",d);
}
return 0;
}
OUTPUT
Enter string
innovation
String after sorting
-----------------------
vtonia
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