Code:
#include iostream
#include stdlib.h
#include string.h
using namespace std;
// A function to generate a random sequence of the given length from a given string.
void GenSequence(char str[], int m, int len, char *seq)
{
int i, j=0, k, index;
for(i = 0; i < m; i++)
{
// Use rand() to generate random indexes.
// Store the very first character directly into the sequence.
if(j == 0)
seq[j++] = str[rand()%len];
// Check for the repetitions.
else
{
h:
index = rand()%len;
for(k = 0; k < j; k++)
{
if(str[index] == seq[k])
goto h;
}
seq[j++] = str[index];
}
}
// End the sequence with null character.
seq[j] = '\0';
}
int main()
{
int n, m, len, i;
char str[100];
cout<<"Enter the base string: ";
cin>>str;
cout<<"\nEnter the number of strings to be generated from the Base string: ";
cin>>n;
cout<<"\nEnter the length of each string to be generated: ";
cin>>m;
len = strlen(str);
// Print the generated sequence.
for(i = 0; i < n; i++)
{
char seq[m];
GenSequence(str, m, len, seq);
cout<<"\nSequence "<
}
return 0;
}
Output:
Case 1:
Enter the base string: abcedfghijklmnopq
Enter the number of strings to be generated from the Base string: 5
Enter the length of each string to be generated: 6
Sequence 1: hfkoqe
Sequence 2: qabkio
Sequence 3: qpeing
Sequence 4: bjaegn
Sequence 5: qpfham
Case 2:
Enter the base string: aabbccddeeffgghhiijj
Enter the number of strings to be generated from the Base string: 5
Enter the length of each string to be generated: 8
Sequence 1: ahaecjbc
Sequence 2: cdfhbicg
Sequence 3: gaijhddf
Sequence 4: jgdjhhbf
Sequence 5: bcafedbi
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