Example: Find Substring Example in C

// Find Substring Example
#include <stdio.h>
#include <string.h> // Required for strstr()

int main() {
    // Step 1: Declare the main string and the substring to find
    char mainStr[] = "The quick brown fox jumps over the lazy dog.";
    char subStr1[] = "fox";
    char subStr2[] = "cat"; // Substring not in main string

    // Step 2: Find the substring using strstr()
    char *resultPtr1 = strstr(mainStr, subStr1);
    char *resultPtr2 = strstr(mainStr, subStr2);

    // Step 3: Print results based on whether the substring was found
    if (resultPtr1 != NULL) {
        printf("Substring \"%s\" found at position: %ld\n", subStr1, resultPtr1 - mainStr);
        printf("Part of string from \"fox\": %s\n", resultPtr1);
    } else {
        printf("Substring \"%s\" not found.\n", subStr1);
    }

    if (resultPtr2 != NULL) {
        printf("Substring \"%s\" found at position: %ld\n", subStr2, resultPtr2 - mainStr);
    } else {
        printf("Substring \"%s\" not found.\n", subStr2);
    }

    return 0;
}