Q:

C program to check subsequence

hamza
Save to bookmark
|
2022-05-18
|
  147 
0

C program to check subsequence

C program to check Subsequence; don't confuse it with substring. In our program, we check if a string is a subsequence of another.

A user will input two strings, and we test if one of them is a subsequence of the other. The program prints yes if either the first string is a subsequence of the second string or the second string is a subsequence of the first string. We pass smaller length string first because our function assumes the first string is of smaller or equal length than the second string.

C programming,
login and add your own answer to this question

All Answers

hamza
2022-05-18
need an explanation for this answer? contact us directly to get an explanation for this answer 

#include <stdio.h>
#include <string.h>
int check_subsequence (char [], char[]);

int main () {
  int t;
  char s1[1000], s2[1000];

  printf("Input first string\n");
  gets(s1);

  printf("Input second string\n");
  gets(s2);

  /** Passing smaller length string first */

  if (strlen(s1) < strlen(s2))
    t = check_subsequence(s1, s2);
  else
    t = check_subsequence(s2, s1);

  if (t)
    printf("YES\n");
  else
    printf("NO\n");

  return 0;
}

int check_subsequence (char a[], char b[]) {
  int c, d;

  c = d = 0;

  while (a[c] != '\0') {
    while ((a[c] != b[d]) && b[d] != '\0') {
      d++;
    }
    if (b[d] == '\0')
      break;
    d++;
    c++;
  }
  if (a[c] == '\0')
    return 1;
  else
    return 0;
}
An output of the program:
Input first string
tree
Input second string
Computer science is awesome
YES

need an explanation for this answer? contact us directly to get an explanation for this answer

total answers (1)

Similar questions

need a help?

find thousands of online teachers now