C Examples

WAP in C to extract a substring from a string inputted by user

The Program in C to extract a substring from a string inputted by user is given below:

#include <stdio.h>

void extract_substring(char str[], int start, int end) {
    for (int i = start; i <= end; i++) {
        printf("%c", str[i]);
    }
}

int main() {
    char str[100];
    int start, end;

    printf("Enter a string: ");
    fgets(str, sizeof(str), stdin);
    str[strcspn(str, "\n")] = 0; //removing new line character

    printf("Enter the start and end indexes of the substring: ");
    scanf("%d %d", &start, &end);

    extract_substring(str, start, end);

    return 0;
}

Output:

Enter a string: Hello Angel
Enter the start and end indexes of the substring: 3 6
lo A

Pro-Tips💡

The program has two main parts: the extract_substring function and the main function.

So, now the extract_substring function takes in three arguments: a character array (str), an integer (start) and an integer (end).

The function uses a for loop to iterate through the characters of the str array starting from the start index and ending at the end index (inclusive).

For each iteration, the function prints out the current character of the str array using the printf function.

The main function is where the program’s execution begins. It first prompts the user to enter a string using the printf function.

It then uses the fgets function to read the entire string including spaces, the strcspn is used to remove the new line character from the string.

Next, it prompts the user to enter the start and end indexes of the substring using the printf function and the scanf function to read the inputs.

Finally, it calls the extract_substring function with the string, start and end indexes as arguments and prints the substring.

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