Explain the following code (what does it do?):

#include

#include

int main()

{

char w[100];

int x, i, j, freq, d;

printf("Enter a string ");

scanf("%s", w);

x = strlen(w);

d = 0;

freq = 1; f

or(; i < x; i++) {

j = 0;

for(; j < x; j++) {

if ((w[i] == w[j]) && (i != j)) {

freq = freq + 1;

}

}

if (freq >= 2) {

printf("D letter: %c, Occurrences: %d ", w[i], freq);

d = 1;

freq = 1;

}

}

if (d < 1) {

printf("No ds found ");

}

return 0;

}